Practice Quiz

Commercial Driver's License

Category - Basic Operation

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If the brakes on a commercial vehicle fail, which of the following will NOT help the driver to maintain control of the vehicle and slow the vehicle?
  1. Pumping the brakes
  2. Shifting the vehicle into a higher gear
  3. Shifting the vehicle into a lower gear
  4. Using an escape ramp
Explanation
Answer: B - If the brakes on a commercial vehicle should fail, putting the vehicle into a higher gear will only cause it to go faster. For this reason, drivers should never shift into a higher gear when their brakes have failed. Downshifting will help the vehicle to slow. Pumping the brakes may generate more hydraulic pressure that can be used to stop the vehicle. Also, using the parking brake, or driving onto an escape ramp can help bring the vehicle to a stop.
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