Practice Quiz

Commercial Driver's License

Category - Inspections

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In order to check hydraulic brakes, drivers should perform which of the following checks?
  1. Start the engine, press down on the brake pedal and hold for five seconds.
  2. Without starting the engine, press down on the brake pedal and hold for five seconds.
  3. Start the engine, pump the brakes several times, then hold for five seconds.
  4. None of the above applies to hydraulic brakes.
Explanation
Answer: A - Not all vehicles have air brakes. Some may have hydraulic brakes. In order to check hydraulic brake systems, drivers should start the engine, hold the brake pedal down for five seconds and see if they feel any movement in the pedal. Loss of pressure can be felt through the pedal as the pedal begins to fade underfoot. This is a serious problem that must be resolved before driving the vehicle on the road.
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