What is the reason for air leakage when releasing the handbrake relay valve?

1 Answers
MaciFitz
07/30/25 6:22am
The pressure at the air outlet end is too low. If there is a sudden damage causing air leakage in the circuit during normal inflation, it means the pressure at the air outlet end is extremely low. When the air compressor is not supplying air, the pressure in the air chamber of the protection valve will also rise until the circuit piston gate is not damaged. Re-inflation can be initiated, but the inflation pressure remains very low, only reaching 0.5-0.55MP. Below is a related introduction to the brake relay valve: Function: The relay valve is part of the automotive air brake system. In the braking system of heavy-duty vehicles, the relay valve serves to shorten the reaction time and pressure build-up time. Differential Relay Valve: It prevents simultaneous operation of the driving and parking systems, overlapping forces in the combined spring brake cylinder and spring brake chamber, thereby avoiding overloading of mechanical transmission components and enabling rapid inflation and deflation of the spring brake cylinder.
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