Which procedure is used for the spring brake test?
Answer: B
With the parking brake and tractor protection valve off, repeatedly press and release the brake pedal until pressure drops to 20 psi.
With the parking brake and tractor protection valve off, repeatedly press and release the brake pedal until pressure drops to 20 psi. The engine may be on or off.
Source: Alabama CDL Manual
All choices
- AWith a fully charged air system, turn the engine off, release all brakes, let the system settle then monitor pressure drop.
- BWith the parking brake and tractor protection valve off, repeatedly press and release the brake pedal until pressure drops to 20 psi.
- CRelease the parking brake, move forward to 5 mph and apply the brakes firmly. Note any pulling to either side.
Why the other answers are wrong
A. With a fully charged air system, turn the engine off, release all brakes, let the system settle then monitor pressure drop.
Choice A is wrong because the spring brake test requires pressing and releasing the brake pedal to reduce pressure, not just monitoring pressure drop.
C. Release the parking brake, move forward to 5 mph and apply the brakes firmly. Note any pulling to either side.
Choice C is wrong because moving forward and applying brakes to check pulling is a brake performance test, not the spring brake test.
Alabama CDL Air Brakes Test Info
Questions on Exam
25
Passing Score
80%
Time Limit
Typically 30 minutes; varies by testing location
Age Requirements
Intrastate: 18+ · Interstate: 21+
Alabama Law Enforcement Agency (ALEA)
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More CDL Air Brakes Practice Questions
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- Which braking technique may be used to stop quickly when you do not have ABS?