SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/cdl-inspect-hydraulic-leak-test

To test hydraulic brakes for leaks, you pump the pedal 3 times, then hold firm pressure for how long?

5 seconds, and the pedal should not move.

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  1. 5 seconds ✔
  2. 2 seconds
  3. 30 seconds

Why: Pump the brake pedal 3 times, then press firmly and hold for 5 seconds. If the pedal moves, there may be a leak or other problem. Get it fixed before driving.

Huh, didn't know that: Trucks with air brakes use the air brake checks instead.

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Why did the brake pad break up with the rotor? Too much friction.
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References

Answer: 5 seconds. Pump the brake pedal 3 times, then press firmly and hold for 5 seconds. If the pedal moves, there may be a leak or other problem. Get it fixed before driving.

  1. California Commercial Driver Handbook (DMV) www.dmv.ca.gov/portal/file/california-commercial-driver-handbook-pdf
    pump the brake pedal 3 times. Then apply firm pressure to the pedal and hold for 5 seconds. The pedal should not move.
    Checked 2026-10-10.

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