Should the Air Brake Not Be Continuously Pressed?

1 Answers
LaHarmony
07/29/25 3:30pm
Air brakes should not be continuously pressed because doing so will deplete the air in the air tank, leading to a loss of braking capability. It also increases the workload of the engine, causing engine vibration. Reasons why air brakes should not be continuously pressed: The principle of air brakes involves using compressed air from the storage tank to inflate the brake chamber, which pushes the brake shoes to achieve braking. Continuously pressing the brake pedal will reduce the air pressure in the tank, eventually leading to insufficient pressure and an inability to brake properly. Additionally, truck brakes are crucial for safety, which is why most truck drivers ensure the air pressure in the air brake system reaches 5-6 Bar before setting off. Consequences of continuously pressing the air brake: Air brakes use a cylinder regulator valve to create resistance against the engine's operation, thereby reducing engine speed and slowing the vehicle. Keeping the exhaust brake engaged for prolonged periods increases the engine's workload, resulting in engine vibration. In severe cases, it can cause the cylinder regulator valve to be forced open and damaged. How the spring brake (parking brake) works: The air pump, driven by the engine, compresses air into high-pressure gas stored in the air tank. One air tank is connected to the brake master cylinder via pipelines. When the driver presses the brake pedal, the upper air circuit opens first, and high-pressure gas from the air tank is transmitted to the relay valve.
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