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A hydraulic brake vehicle loses its pedal (the pedal goes to the floor). What technique can sometimes build enough pressure for a stop?
- A.Turning the steering wheel side to side
- B.Pressing the accelerator and brake together
- C.Pumping the brake pedal rapidly to build whatever pressure the system can still generate
- D.Opening the brake fluid reservoir while moving
Correct answer
C. Pumping the brake pedal rapidly to build whatever pressure the system can still generate
Why
Pumping is the standard first response for a sinking hydraulic pedal, because each stroke can add a little pressure if any part of the circuit still seals. If pumping builds nothing, the parking brake and escape route become the stop.
Manual topic: Brake Failure - Hydraulic Systems · From the General Knowledge practice bank (GK-246).