header bg

Question:

During your final air brake check, if the air pressure does not build up fast enough,

A the air pressure may drop too low during driving.
Explaination

The manufacturer's specifications should state how fast the air pressure should build up once the engine has reached normal operating speed. If the air pressure does not build up fast enough during your final air brake check, the air pressure may not replenish quickly enough during normal braking either. Don't drive the vehicle until the cause has been found and corrected.