During the application portion of an air test, if a car's brakes are not applied, how many times may the car be retested, and how long must the brake remain applied during the test?

During the application portion of an air test, if a car's brakes are not applied, how many times may the car be retested, and how long must the brake remain applied during the test?

• A. Twice; the brake must remain applied for at least 2 minutes
• B. Once; the brake must remain applied for at least 3 minutes
• C. Three times; the brake must remain applied for at least 1 minute
• D. It cannot be retested; the brake need not be applied

Answer: (B)

During the application portion, the test checks that when the brakes are applied, the system can hold pressure and stay engaged for a sustained period. The brake must be kept applied for a full three minutes to demonstrate a stable hold and detect any excessive leak or drop in pressure. If the brakes aren’t applied on the first try, you’re allowed a single retest to perform the test again. So the correct approach is to allow one retest and require the brake to remain applied for at least three minutes.

During the application portion, the test checks that when the brakes are applied, the system can hold pressure and stay engaged for a sustained period. The brake must be kept applied for a full three minutes to demonstrate a stable hold and detect any excessive leak or drop in pressure. If the brakes aren’t applied on the first try, you’re allowed a single retest to perform the test again. So the correct approach is to allow one retest and require the brake to remain applied for at least three minutes.