CDL · Emergencies
You are driving on flat ground in a vehicle with hydraulic brakes. When you step on the brake pedal, it sinks all the way to the floor. Which statement is correct?
Correct answer: Pumping the pedal may build up enough pressure to stop the vehicle.
Answer options
- AIf the transmission is automatic, you should not downshift
- BPumping the pedal may build up enough pressure to stop the vehicle Correct
- CThe parking brake is useless as well, because it runs on the same hydraulic system
Why
If a hydraulic brake pedal goes to the floor, pumping it a few times may restore enough pressure to stop, and you should downshift to help slow down with either a manual or an automatic transmission. The parking brake is independent of the hydraulic service brakes, so it remains available to help slow the vehicle.
About this question
Topic: Emergencies License: CDL
Part of these practice sets:
Where it applies: Asked in every state.
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This question is part of Emergency Maneuvers and Failures (14 questions). Take the full set and check your score.
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