Construindo uma linha de segurança de frenagem: detalhes da composição e manutenção do sistema de freio a ar

Quais são os principais componentes do sistema de freio a ar do caminhão?

O sistema de freio a ar do caminhão é uma garantia importante para a condução segura de veículos de grande porte. Ele depende de ar comprimido para acionar o dispositivo de freio e obter um efeito de frenagem eficiente e confiável. O sistema possui uma estrutura complexa e é composto por diversos componentes profissionais. As várias peças cooperam entre si para garantir que o veículo possa travar de forma estável sob diferentes condições de trabalho.
Compressor de ar
O air compressor is the power source of the entire air brake system. Its main function is to use the engine power to compress the air, compress the air in the atmosphere to a high pressure state, and provide the system with the air source required for braking. The air compressor is usually driven by the engine crankshaft belt, with a sturdy structure and high working efficiency. The compressed air has a high pressure and temperature and needs to be processed later before it can be used.
Secador de ar
O air dryer is installed between the air compressor and the air tank. Its main function is to remove moisture and oil from the compressed air to prevent ice and corrosion inside the system. If the moisture in the air is not removed in time, it will cause the brake line to freeze in cold weather, seriously affecting the braking performance. The air dryer contains a desiccant inside, which can effectively absorb moisture, and is equipped with an automatic drainage device to keep the air dry and clean.
Tanque de ar
O air tank is used to store compressed air that has been dried to ensure that the brake system has a stable and continuous air supply when in use. The air tank is usually divided into a main air tank and an auxiliary air tank, and the capacity is determined according to the size of the vehicle and the braking demand. Condensation often accumulates inside the air tank and needs to be discharged regularly to prevent internal corrosion and blockage of the pipeline.
Válvula de freio (válvula de freio de pé)
O brake valve is a key component for the driver to control air brakes. When the brake pedal is pressed, the brake valve adjusts the air pressure to the brake chamber, drives the brake mechanism to operate, and achieves vehicle deceleration or parking. The brake valve used in modern trucks usually integrates pressure feedback and multi-stage adjustment functions to ensure sensitive braking response and safety and reliability.
Câmara de ar do freio
O brake air chamber is the core component that converts air pressure into mechanical force. A diaphragm or piston is arranged in the air chamber, which pushes the connecting rod after receiving the air pressure from the brake valve, and drives the brake shoe or brake pad to press the brake drum or brake disc. Brake chambers are divided into service brake chambers and spring brake chambers. The service brake chamber is mainly responsible for braking when the vehicle is driving, while the spring brake chamber is used for parking and emergency braking.
Câmara do freio de mola
O spring brake chamber is equipped with a strong preload spring, which uses the mechanical force of the spring to maintain the braking state. This component is mostly used for parking brakes to ensure that the vehicle does not slip when parking. After the engine is started and inflated, the air pressure will compress the spring and release the braking state. The safety performance of the spring brake chamber is extremely important, and the integrity and air pressure of the spring need to be checked regularly.
Biela e regulador do freio
O brake connecting rod transmits the thrust of the brake chamber to the brake mechanism to complete the conversion of air pressure to mechanical force. The regulator is responsible for automatically or manually adjusting the gap between the brake shoe and the brake drum to compensate for the wear of the brake shoe and maintain the braking efficiency. The automatic regulator can reduce the frequency of manual adjustment and improve the stability and safety of the system.
Linha de freio
O brake line includes the air pipeline connecting the compressor, air tank, brake valve and air chamber. The pipeline material must be resistant to high pressure, corrosion and cold, and is usually made of a combination of rubber hoses and steel hard pipes. Reasonable pipeline design can prevent air pressure leakage and mechanical damage, and is the basis for ensuring the air tightness and stability of the brake system.
Válvula de segurança
O safety valve is installed at the air tank and key pipeline positions to prevent the system air pressure from exceeding the set upper limit. When the system air pressure rises abnormally, the safety valve automatically opens to release excess gas to avoid bursting of the air tank or pipeline and ensure system safety. The safety valve must be inspected regularly to ensure its reliability.
Dispositivos auxiliares
O air brake system is equipped with a variety of auxiliary devices, such as barometers, air pressure alarms and pressure sensors. The barometer provides the driver with real-time air pressure information, and the air pressure alarm sounds an alarm when the air pressure is lower than the safety threshold, reminding the driver to deal with it in time. The pressure sensor provides data support for the vehicle's electronic control unit to ensure intelligent management of the system.

Como a câmara do freio converte a pressão do ar em força mecânica?

O brake chamber is a key actuator in the truck air brake system. Its core function is to convert the air pressure energy of compressed air into mechanical force, thereby driving the brake mechanism to slow down or stop the vehicle. The design structure and working principle of the brake chamber are directly related to the response speed of the brake system and the stability of the braking force.
Estrutura básica da câmara de freio
O brake chamber is mainly composed of a chamber shell, a diaphragm (or piston), a push rod and a spring. The chamber shell is made of solid metal material, and the interior is divided into two main spaces: the air pressure chamber and the spring chamber. The diaphragm is usually made of wear-resistant rubber material, with good sealing performance and can withstand repeated changes in air pressure. The push rod connects the diaphragm or piston to transmit the thrust generated by the air pressure to the brake mechanical part.
Distinção funcional entre a câmara de pressão de ar e a câmara de mola
O air pressure chamber is the part of the brake chamber that receives compressed air. Air enters the air pressure chamber from the brake valve through the pipeline, and the air pressure increases, pushing the diaphragm or piston outward. The spring chamber is equipped with a preloaded spring to provide reverse force and is used for parking brakes. When the air pressure is low, the spring force pushes the push rod back to the initial position and releases the brake state.
Princípio de funcionamento da conversão da pressão do ar em força mecânica
Quando o motorista pisa no pedal do freio, a válvula do freio introduz ar comprimido na câmara de pressão de ar da câmara de ar do freio. A pressão do ar na câmara de pressão de ar aumenta rapidamente, agindo na superfície do diafragma para gerar impulso. A magnitude do impulso é proporcional à pressão do ar e à área do diafragma. O diafragma se expande para fora sob a ação da pressão do ar, empurrando a haste conectada para se mover axialmente. O movimento da biela aciona a biela e o mecanismo de ajuste para converter a energia da pressão do ar em força mecânica, que é aplicada à sapata ou pastilha de freio para conseguir a fixação do tambor de freio ou disco de freio.
Transmissão mecânica do movimento da haste
O end of the push rod is usually connected to the brake connecting rod through a pin or a ball head. The axial movement of the push rod drives the brake mechanism to work. The brake connecting rod converts the linear motion of the push rod into the clamping motion of the brake shoe, forming friction and generating braking force. The distance the push rod moves determines the magnitude of the braking force, and a reasonable push rod stroke design ensures the linearity and sensitivity of the braking effect.
O difference between diaphragm and piston and their influence
O diaphragm structure in the brake chamber uses a flexible diaphragm to transmit air pressure thrust. It has a simple structure and light weight, and is suitable for light and medium trucks. The piston chamber uses a rigid piston instead of a diaphragm, which has better sealing and is suitable for heavy vehicles. The piston structure reacts faster to changes in air pressure, and the mechanical force transmission is more stable, which improves braking performance and reliability.
Funções especiais das câmaras de freio de mola
O spring brake chamber is equipped with a large preload spring outside the air pressure chamber, which is often used for parking brakes. During normal operation, the air pressure compresses the spring, the push rod is in a loose state, and the brake is released. When parking or emergency braking, the system air pressure is cut off, the spring releases energy to push the push rod, and the mechanical force acts on the brake mechanism to lock the wheel and achieve parking brake. The spring brake chamber ensures that the vehicle can remain in a safe parking state even if the air source is interrupted.
Estanqueidade ao ar e velocidade de resposta da câmara do freio
O air tightness inside the chamber directly affects the effective conversion and response speed of air pressure energy. Poor sealing will cause air pressure leakage, weaken the push rod pushing force, and increase the risk of brake failure. High-quality diaphragm materials and sealing design ensure that the brake chamber maintains good performance under extreme working conditions. The rapid air pressure charging and discharging process ensures rapid braking response and improves driving safety.
Manutenção e manifestações de falhas das câmaras de freio
Falhas comuns, como ruptura dos diafragmas da câmara do freio, travamento da haste ou fadiga da mola, podem levar à falha do freio ou do freio de estacionamento. A verificação regular da estanqueidade da câmara de ar e a detecção do curso da haste e do estado da mola são a chave para garantir a confiabilidade do sistema de freio. O teste de pressão de ar e a detecção de vazamentos podem detectar perigos ocultos com antecedência e evitar acidentes de trânsito.

Por que os secadores de ar são importantes para sistemas de freio a ar

Secador de ars are an indispensable key component in truck air brake systems. Its main function is to remove moisture and impurities from compressed air to ensure the normal operation and long-term durability of the internal pipes and components of the brake system. The role of air dryers is directly related to the reliability, safety and maintenance cost of the brake system.
Umidade no ar comprimido e seus perigos
O air brake system relies on an engine-driven air compressor to supply high-pressure air. After the air is compressed, the temperature rises, and the water vapor in the air begins to condense into water droplets during the cooling process. If these moisture are not effectively treated, they will enter the air tank and pipeline with the air, causing a variety of serious problems. Condensed water accumulates inside the pipeline and may freeze in a low temperature environment, blocking the air path and causing brake failure. Moisture can also cause rust and corrosion of internal parts of the system, reduce equipment life and cause leaks. Excessive moisture can also affect air pressure stability and cause insensitive brake response.
Princípio de funcionamento do secador de ar
Secador de ars are usually installed between the air compressor and the air tank. Its core part is a desiccant (such as silica gel or molecular sieve), which can efficiently absorb moisture from the air. When compressed air enters the dryer, moisture is absorbed by the adsorbent, and the air discharged after treatment remains dry and clean. Modern air dryers are mostly equipped with automatic drain valves to regularly discharge moisture and impurities accumulated in the adsorbent to prevent water accumulation and blockage, ensuring a long-lasting and stable drying effect.
Prevenção de falha de gelo no sistema de freio
Em ambientes de baixa temperatura, a umidade na tubulação de ar é muito fácil de congelar, bloqueando a válvula do freio e a câmara de ar, causando falha no freio ou até mesmo perda de controle do veículo. Os secadores de ar removem efetivamente a umidade e evitam o acúmulo de água condensada, reduzindo bastante o risco de bloqueio de gelo. Principalmente para veículos que circulam em zonas frias ou no inverno, destaca-se a importância dos secadores de ar, que garantem diretamente a segurança e estabilidade da travagem do veículo.
Proteja os principais componentes do sistema de freio
O internal pipes, valves, air chambers and air tanks of the braking system are all precision machinery and sealing components, which are extremely susceptible to moisture erosion. Long-term water vapor intrusion can cause metal rust, aging of sealing rings, and valve jamming, affecting braking performance. Air dryers extend the service life of these key components by providing dry air, reduce failure rates and maintenance costs, and improve the overall operating efficiency of vehicles.
Melhore a estabilidade da pressão de ar do sistema e a velocidade de resposta
A umidade excessiva pode causar flutuações e vazamentos na pressão do ar, afetando a estanqueidade e a estabilidade da pressão do ar do sistema de freio. Os secadores de ar podem garantir que o ar que entra no tanque de ar e nas tubulações esteja seco e puro e garantir um fornecimento estável de pressão de ar. A pressão de ar estável apoia a ação eficiente da câmara de freio, melhora a velocidade de resposta de frenagem e a força de frenagem e melhora a segurança ao dirigir.
Reduza a dificuldade e o custo de manutenção
Sistemas sem secadores de ar ou com efeitos de secagem deficientes requerem drenagem frequente, limpeza de tubulações e substituição de peças corroídas e danificadas, aumentando a frequência e os custos de manutenção. Os secadores de ar reduzem a intervenção manual e a carga de trabalho de manutenção, desumidificando e drenando automaticamente a água. A taxa de falhas do sistema diminui, o tempo de funcionamento do veículo aumenta e o custo operacional é significativamente reduzido.
Tipos e cenários aplicáveis de secadores de ar
Os secadores de ar comuns incluem secadores de adsorção e secadores refrigerados. Os secadores por adsorção absorvem a umidade por meio do dessecante, possuem estrutura simples e são amplamente utilizados em sistemas de freio a ar de caminhões. Os secadores refrigerados condensam e descarregam a umidade diminuindo a temperatura do ar, o que é adequado para requisitos ambientais especiais. Diferentes tipos de secadores são combinados com o ambiente operacional do veículo e as condições de trabalho para selecionar o modelo apropriado para garantir o melhor efeito de secagem.
Pontos-chave para manutenção de secadores de ar
O dessecante precisa ser substituído regularmente para evitar falha de saturação do dessecante. A função da válvula de drenagem precisa ser mantida normalmente para garantir a remoção oportuna de água condensada e impurezas. A carcaça e a interface do secador de ar devem ser verificadas quanto a vazamentos e bom desempenho de vedação. A manutenção inadequada fará com que o secador falhe, o que por sua vez afetará o desempenho de segurança de todo o sistema de freio.

Como a válvula do freio (válvula de pé) controla a pressão do ar do freio?

O brake valve, also known as the foot brake valve, is a key component in the truck air brake system where the driver directly controls the brake air pressure. Its main function is to accurately adjust the air pressure according to the force and stroke of the driver's foot on the brake pedal, and drive the brake chamber to achieve vehicle braking. The design and working principle of the brake valve directly affect the response speed, stability and safety performance of the brake system.
Estrutura básica da válvula de freio
O brake valve is mainly composed of a valve body, a piston or a sliding valve, a spring, a sealing ring and an adjustment mechanism. There are multiple air passages inside the valve body, which are responsible for guiding the air flow. The piston or sliding valve moves under the action of the spring force and air pressure to control the air flow interruption. The brake pedal drives the piston to move through a mechanical connecting rod or an electronic sensor to complete the air pressure regulation.
Princípio de funcionamento da válvula de freio
Quando o motorista pisa no pedal do freio, o pistão dentro da válvula do freio avança com o curso do pedal. O movimento do pistão altera o estado de abertura e fechamento do circuito de ar dentro do corpo da válvula e controla o ar do tanque de ar para a câmara de pressão de ar da câmara do freio. Quanto mais fundo o pedal for pisado, maior será a abertura da válvula e maior será a pressão do ar que entra na câmara do freio. O aumento da pressão do ar empurra o diafragma ou pistão da câmara do freio, gerando um impulso mecânico para conseguir a frenagem. Solte o pedal, o pistão é reiniciado, o circuito de ar é fechado, a pressão do ar é liberada e o freio é liberado.
Controle preciso da regulação da pressão de ar do freio
O brake valve achieves continuous variable adjustment of air pressure through an internal adjustment mechanism. The valve body is designed with a pressure adjustment spring and a feedback device, which can finely adjust the output air pressure according to the pedal force. Accurate air pressure control ensures a smooth transition of braking force, avoids braking shock and vehicle shaking, and improves driving comfort and safety.
Projeto de circuito de ar multidirecional e garantia de segurança
O brake valve is equipped with multiple air circuits, which lead to different air tanks and air chambers to ensure stable air pressure supply. Some brake valves are equipped with a dual-circuit design, one circuit controls the front axle air chamber and the other controls the rear axle air chamber to improve braking safety. Some advanced brake valves also have an air pressure protection function. When the system air pressure is lower than the set value, the braking force is automatically limited to prevent brake failure.
Velocidade de resposta e desempenho de vedação da válvula de freio
O internal sealing ring and air circuit design of the brake valve directly affect the response speed of air pressure changes. Efficient sealing prevents air leakage and ensures stable air pressure. The brake valve with a compact structure and reasonable spring force can quickly respond to the driver's braking command, achieve rapid braking response, and enhance driving safety.
Coordenação da válvula do freio de pé e do sistema de freio de estacionamento
O foot brake valve is mainly responsible for service braking during driving. The brake valve of some models integrates the parking brake function or is linked with the parking brake valve. The spring brake chamber is controlled by air pressure changes to realize the opening and release of the parking brake. The system design ensures that the parking brake and foot brake work together to meet different driving needs.
Manifestações de manutenção e falha de válvulas de freio
Envelhecimento das vedações das válvulas de freio, travamento do pistão ou falha da mola são causas comuns de falha. Isto leva a uma regulação insensível da pressão do ar, fugas de ar ou travagens irregulares. Verifique regularmente a estanqueidade do ar, o curso do pedal e o estado dos componentes internos da válvula do freio para garantir seu desempenho normal. Se uma falha for encontrada, ela deverá ser reparada ou substituída a tempo de evitar riscos à segurança.

Qual o papel da válvula de segurança no sistema de freio a ar?

O safety valve is a vital protective component in the air brake system. It is responsible for releasing excess air pressure when the system pressure rises abnormally, preventing system components from being damaged by overpressure, and ensuring the safety and stable operation of the entire brake system. Although the safety valve does not directly participate in the braking action, it plays an important role in the operation of the system.
O basic structure and principle of the safety valve
O safety valve is usually composed of a valve body, a valve seat, a spring, a valve core and an adjustment mechanism. The valve core seals the valve seat under the action of the spring force to maintain the closed state of the system. The spring preload sets the maximum safe air pressure of the system. When the system air pressure exceeds the set value, the air pressure overcomes the spring force to push the valve core open, and the overpressure gas is released through the exhaust port. After the air pressure drops to a safe range, the spring resets the valve core, reseals the valve seat, and the system returns to normal working state.
Controle o limite superior da pressão do ar para evitar sobrepressão do sistema
O air brake system is supplied with air by an air compressor. If the control system fails or the compressor continues to work without stopping, the air pressure may continue to rise. Overpressure can damage and even burst components such as air reservoirs, brake valves, pipelines, and air chambers. The safety valve opens the exhaust in time before the air pressure reaches a dangerous level through the set opening pressure (usually 10%~15% of the upper limit of the system working pressure), playing the role of "the last line of defense" to avoid system damage and accidents.
Proteja o compressor de ar e os componentes do circuito de ar
O air compressor is a high-frequency component in the brake system, and it is very easy to be damaged due to excessive back pressure during long-term operation. The safety valve releases excess air pressure in the system compression chamber or the main air tank, effectively reducing the compressor load and preventing problems such as shaft seal damage and cylinder jamming caused by back pressure. At the same time, the safety valve also protects the pipeline interface and air circuit valve to avoid impact rupture caused by sudden pressure changes and extend the service life of the system.
Garantir o funcionamento estável do sistema de travagem do veículo
O air brake system must operate in a stable air pressure environment. Excessive air pressure not only damages the components, but also causes excessive braking response and excessive braking force, causing tire locking and vehicle loss of control. The safety valve limits the peak pressure and keeps the system pressure within a safe range, ensuring that the braking response is linear and controllable, and enhancing the driver's sense of safety and predictability.
O rationality of the set pressure value and the system match
O opening pressure of the safety valve should be higher than the normal working pressure of the brake system (usually 0.81.0 MPa), but lower than the maximum pressure bearing capacity of the system. It is generally set to 1.11.2 MPa. If the pressure is set too low, it is easy to open frequently and cause unstable air pressure; if it is set too high, it loses its protective effect. Reasonable setting requires comprehensive consideration of factors such as vehicle air path volume, braking frequency, and compressor air output to ensure that the safety valve intervenes only under real overpressure conditions, taking into account safety and system efficiency.
Local de instalação e escopo de ação da válvula de segurança
O safety valve is usually installed on the main air tank or the main line of the total air path, giving priority to releasing the total pressure of the system. Some systems are also equipped with local safety valves on branch air tanks or independent air paths to protect branch circuit components. The installation location should ensure smooth exhaust and stay away from high temperature or flammable areas to prevent secondary risks caused by exhaust. The multi-level protection design enhances the robustness of the system and improves the safety level of the vehicle.
Requisitos de material e durabilidade das válvulas de segurança
Válvula de seguranças are subjected to high-pressure gas for a long time, and key components such as valve cores, springs, and valve seats must have high strength, corrosion resistance, and fatigue resistance. Common materials include stainless steel, chromium-molybdenum alloy, engineering plastics, etc. The sealing part must have high temperature resistance and pressure change resistance to ensure that the valve remains sealed reliably during high-frequency opening and closing to avoid air pressure leakage or malfunction.
Inspeção de manutenção e risco de falha de válvulas de segurança
Válvula de seguranças are passive action devices. Long-term non-operation is prone to problems such as spring fatigue, valve core jamming, and seal aging. Regular opening and closing tests, cleaning of carbon deposits and foreign matter, and testing of opening pressure are necessary means to maintain its functional reliability. A failed safety valve may not be able to open when overpressure occurs, resulting in system damage or accidents; it may also open prematurely, affecting the inflation speed and efficiency of the brake system.
Cooperação entre válvula de segurança e sistema de regulação de pressão
Os sistemas de freio a ar geralmente são equipados com reguladores de pressão, pressostatos e válvulas de segurança que funcionam juntos. O regulador de pressão controla a partida e a parada do compressor, o pressostato monitora o feedback da pressão do ar e a válvula de segurança é usada como um dispositivo de proteção redundante para garantir que vários mecanismos de segurança sejam eficazes. O projeto e o ajuste da válvula de segurança devem ser coordenados com todo o sistema de controle de pressão de ar para evitar falsos acionamentos ou funções sobrepostas e melhorar a segurança geral do sistema.

Quais são as prioridades de manutenção diária do sistema de freio a ar?

Como um dispositivo de segurança crítico em veículos pesados ​​(como caminhões, ônibus e reboques), a estabilidade operacional do sistema de freio a ar está diretamente relacionada ao efeito de frenagem e à segurança no trânsito de todo o veículo. O sistema consiste em um compressor de ar, um reservatório de ar, um secador, uma válvula de freio, uma câmara de ar de freio, um tubo de ar e uma variedade de componentes de controle. Possui uma estrutura complexa e opera com frequência. A manutenção diária científica e padronizada pode não apenas prolongar a vida útil do sistema, mas também prevenir eficazmente falhas repentinas nos freios.
Verifique a estanqueidade do sistema
O air tightness of the system is the core of ensuring stable air pressure. During maintenance, it is important to check whether there is air leakage at various pipe joints, hoses, connectors, welds of air reservoirs, and valve body interfaces. Use soapy water smearing method or a special leak detector to detect subtle leaks. For rubber hoses, check whether they are aging, cracked, or falling off. Good air tightness can prevent the system air pressure from dropping too quickly, ensuring the reliability of emergency braking and parking brakes.
Drene regularmente a água e as impurezas do tanque de ar
O air tank is a gathering place for compressed air and is also the main area for condensed water and impurities to deposit. If it is not discharged in time, the water will corrode the cylinder, block the valve, and seriously affect the braking response. The air tank drain valve should be opened every day after parking to drain manually, especially in an environment with high humidity or low temperature. Some vehicles are equipped with automatic drainage devices, and their drainage function should also be checked regularly to prevent water accumulation.
Verifique as condições de funcionamento do secador de ar
O air dryer is the first line of defense to prevent moisture from entering the brake system. It is necessary to regularly check whether the dryer filter element or adsorbent is saturated and ineffective. If it is found that the drying effect has deteriorated or a large amount of water is discharged from the air tank, the dryer filter element should be replaced in time. Note that the dryer exhaust port should be unobstructed and the exhaust valve should be sensitive to prevent water accumulation or freezing.
Mantenha a válvula de freio responsiva
O brake valve is the most directly related component of the air brake system to the driver's control. The brake valve pedal stroke should be checked regularly to see if it is appropriate, if the action is smooth, and if there is any jamming, air leakage or poor return. Check if the air chambers respond consistently during braking to avoid brake deflection or tail swinging due to asynchronous braking of the front and rear wheels. Disassemble and clean or replace seals if necessary.
Verifique a câmara do freio e o status da haste
O brake chamber converts air pressure into mechanical braking force, and its reliability directly affects the braking effect. Focus on checking whether the air chamber shell is deformed, rusted or cracked, whether the push rod is freely retracted, and whether the dust cover is intact and undamaged. The spring mechanism of the parking brake spring chamber must function normally and the exhaust channel must be unobstructed. The push rod stroke must meet the manufacturer's standards to avoid insufficient braking force or damage to the air chamber.
Mantenha o tubo de ar e a conexão da junta firmemente
O air pipe connecting the various components in the brake system needs to have sufficient pressure resistance and heat resistance. Check the pipeline for looseness, detachment, rupture, expansion or wear on a daily basis. In particular, the hoses at the chassis or active parts of the vehicle are susceptible to vibration and dust. The connection joints should be tightened reliably, and the quick-connect joints should be cleaned of foreign objects regularly to prevent leakage. Pipes used for a long time should be replaced according to the degree of aging.
Verifique o freio de emergência e o sistema de freio de estacionamento
O freio de emergência e o freio de estacionamento são mecanismos importantes para garantir que o veículo ainda possa parar de forma confiável quando o gás for cortado ou o motor for desligado. A manutenção diária deve verificar se a câmara de ar do freio de mola pode aplicar o freio automaticamente quando o gás é cortado. A alavanca ou interruptor de estacionamento deve ser preciso e sensível. A capacidade de manutenção da pressão de estacionamento após o desligamento do sistema deve atender ao padrão para evitar que o veículo deslize devido ao vazamento de pressão de ar.
Detecção de manômetro e dispositivo de alarme
O pressure gauge on the instrument panel is an important basis for the driver to understand the system status. It is necessary to confirm that the pressure gauge display is accurate and without deviation on a daily basis. The high-pressure and low-pressure alarm indicators and buzzers should alarm in time when the air pressure is abnormal. If necessary, check the working status of the electrical circuit and sensor to avoid blind driving caused by the failure of the alarm system.
Execute o teste de estabilidade da pressão de ar do sistema
Observe a velocidade de aumento da pressão do ar operando o motor em marcha lenta e verifique se a potência do compressor é suficiente. O sistema deve manter a velocidade de queda de pressão após o motor ser desligado para atender ao padrão. O tempo de resposta do freio e a taxa de queda de pressão podem ser observados pisando manualmente no pedal do freio para avaliar a capacidade de resposta do sistema e a capacidade de armazenamento de ar.