Arizona Air Brakes CDL Practice Test

When testing air leakage rates for combination vehicles (before applying the brake pedal), air brake systems should not lose air faster than...

1. 2 psi per minute

2. 3 psi per 30 seconds

3. 3 psi per minute

4. 4 psi per minute

The correct answer is: 3 psi per minute

When testing air leakage rates for combination vehicles, the acceptable standard dictates that the air brake system should not lose air faster than 3 psi per minute. This rate is crucial for ensuring the reliability and safety of the braking system. If the system loses air at a rate greater than this threshold, it could indicate potential issues such as leaks or malfunctions that might compromise the braking performance. Maintaining the standard helps to ensure that the brakes will function properly in emergency situations. A vehicle with excessive air loss could lead to brake failure, which poses significant risks to the driver and other road users. Therefore, adhering to this specific leakage rate is essential for safety checks and ensures that the air brake system retains enough air pressure to operate effectively.