What does insufficient brake air pressure for starting mean?

1 Answers
Reagan
07/29/25 4:18pm
Insufficient brake air pressure for starting means that the brake air pressure has not yet reached the level required for the vehicle to start. The following are specific details about air brake systems: 1. Air brakes are generally used in large vehicles, where pressing the brake pedal results in a rapid and noticeable braking effect. For driving safety, the brake air reservoir must maintain a pressure of at least 4 bars to ensure the vehicle can brake and stop at any time due to changing road conditions. Insufficient brake air pressure can affect braking performance. 2. Large vehicles use air compressor brakes, so it is necessary to idle for a few minutes to allow the air compressor to replenish sufficient air before driving, to avoid a lack of braking force. When the air brake is applied, the driver presses the brake pedal, opening the brake control valve, which connects the passage from the air reservoir to the brake chamber. This allows the compressed air in the air reservoir to flow through the brake control valve into the brake chamber. 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 applying the wheel brakes.
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