Practice Quiz

Commercial Drivers License Exam Prep

Category - CDL

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In the event of a hydraulic brake pressure failure, drivers can do which of the following actions to help bring the vehicle to a stop?
  1. Put the vehicle into a lower gear and pump the brakes.
  2. Put the vehicle into a higher gear and pump the brakes.
  3. Avoid using the parking brake at all costs.
  4. None of the above will help with hydraulic brake failure.
Explanation
Answer: A - In the event of hydraulic brake pressure failure drivers should put the vehicle into a lower gear and pump the brakes. Using a lower gear will help to slow the vehicle, and drivers can downshift as needed to even lower gears, thus slowing the vehicle progressively. Pumping the brakes may create enough pressure to bring the vehicle to a stop. Putting the vehicle into a higher gear will cause it to go faster. At times, using the parking brake may also be helpful as this brake is separate from the hydraulic system.
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