Practice Quiz

Commercial Driver's License

Category - Emergencies

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When using the "stab braking" method of emergency braking, which of the following should NOT be used?
  1. Apply full brakes until wheels lock up.
  2. Release brakes once locked up and reapply brakes.
  3. Gradually and gently pump the brakes.
  4. None of the above should be used in this braking method.
Explanation
Answer: C - When using the "stab braking" method for emergency braking drivers should NOT gently or gradually hit the brakes. For this method to work effectively, aggressive braking is required. Once the wheels lock up (and they will), drivers must release the brake and wait for the wheels to turn freely again. This may take a second or so to happen. Then reapply the brakes hard and repeat the process until the vehicle comes to a stop or the danger is passed.
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