If you lose your hydraulic brakes (not air brakes), you should:

All of the above.. Section 2.17: If hydraulic brakes fail: Pump the pedal, use the parking brake, and downshift.

If you lose your hydraulic brakes (not air brakes), you should:

ANSWER BREAKDOWN
  • A. Incorrect. "Pump the brake pedal." is not correct. If hydraulic brakes fail: Pump the pedal, use the parking brake, and downshift.
  • B. Incorrect. "Use the parking brake." is not correct. If hydraulic brakes fail: Pump the pedal, use the parking brake, and downshift.
  • C. Incorrect. "Shift to a lower gear." is not correct. If hydraulic brakes fail: Pump the pedal, use the parking brake, and downshift.
  • D. Correct. If hydraulic brakes fail: Pump the pedal, use the parking brake, and downshift.