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What is the reason for insufficient air pressure after stepping on the brakes several times?

1 Answers

McKendra

07/30/25 2:39am

The reason for insufficient air pressure after stepping on the brakes several times is a problem with the brake valve. Problems with the brake valve: When the vehicle's air reservoir cannot store enough compressed air, the brake valve's air supply is insufficient; air leaks in the brake valve pipeline or blockages in the air circuit can both result in insufficient compressed air pressure generated by the braking system during braking. Braking with air pressure: During air pressure braking, when the driver steps on the brake pedal, the brake control valve opens, connecting the passage from the air reservoir to the brake chamber. This allows the compressed air in the air reservoir to enter the brake chamber through the brake control valve. Sufficient air pressure pushes the brake chamber push rod outward, driving the brake adjustment arm to rotate the cam. The rotation of the cam causes the brake shoes to expand and press against the brake drum, thereby braking the wheel. If the pressure is insufficient, it cannot push the chamber push rod outward to expand the brake shoes and press them against the brake drum, thus failing to brake the wheel.

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