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What Causes a Truck's Air Brake to Lose Air After a Few Presses?

1 Answers

WalkerLee

07/30/25 7:37am

It is caused by air leakage in the wheel cylinder pipelines or valve bodies. Below are specific details about air brakes: 1. Principle of air brakes: Also known as exhaust brakes, air brakes serve as an auxiliary braking system and cannot replace service brakes. A regulating valve is installed on the engine's exhaust pipe, and by closing this valve, the exhaust stroke pressure is increased, utilizing the generated negative pressure to obtain braking force. 2. Function of air brakes: Their purpose is to reduce or maintain vehicle speed without or with minimal use of service brakes, but they cannot bring the vehicle to an emergency stop. 3. Usage of air brakes: When the exhaust brake is engaged, the accelerator pedal is at zero position, and the fuel injector stops injecting fuel. If the accelerator or clutch pedal is pressed, the exhaust brake will automatically disengage, preventing engine stalling during stops and avoiding exhaust brake activation during fuel injection.

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