Stab braking:
Answer: B
Apply your brakes all the way. Release the brakes when wheels lock up. As soon as the wheels start rolling, apply the brakes fully again.
Stab braking is one of two emergency braking techniques. Stab braking involves applying the brakes hard until the wheels lock up, then immediately releasing the brakes until they begin rolling once more. This process is then repeated. Be sure the wheels have started rolling again before applying the brakes again.
All choices
- APress hard on brake pedal and apply the hand valve as you stop.
- BApply your brakes all the way. Release the brakes when wheels lock up. As soon as the wheels start rolling, apply the brakes fully again.
- CUse light steady pressure on the brake pedal.
Why the other answers are wrong
A. Press hard on brake pedal and apply the hand valve as you stop.
Choice A is wrong because applying the hand valve while pressing the brake pedal is not part of the stab braking technique.
C. Use light steady pressure on the brake pedal.
Choice C is wrong because light steady pressure describes controlled braking, not stab braking.
CDL Air Brakes Test Info
Questions on Exam
25
Passing Score
80%
Time Limit
Typically 30 minutes; varies by testing location
The Air Brakes test content is federally standardized, so this question applies in every state. Age limits, fees, and testing procedures do vary — check your state's CDL requirements.
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