A commercial driver operating a vehicle with hydraulic brakes discovers that the brake pedal goes directly to the floor without slowing the truck while exiting a highway. Place the standard emergency procedures in the correct sequence from the first action to take to the final action.
- 1Downshift the transmission into a lower gear to use engine compression braking.
- 2Pump the brake pedal rapidly to generate hydraulic fluid pressure.
- 3Apply the parking or emergency brake while holding the release mechanism.
- 4Steer the vehicle toward an open escape path, soft shoulder, or uphill grade.
Answer
The proper sequence for managing a sudden hydraulic brake failure is: downshift the transmission into a lower gear, pump the brake pedal rapidly, apply the parking brake while modulating the release, and steer toward an escape route or shoulder.
When hydraulic brakes fail, standard commercial vehicle safety procedures dictate immediate downshifting to harness engine braking, followed by pumping the pedal to restore any remaining hydraulic pressure. If pressure cannot be restored, the driver applies the parking brake with the release mechanism held to avoid wheel lockup, and finally guides the truck toward an escape route or soft ground to stop safely.
Step-by-Step Solution
Key Concept
Correct emergency response sequence for hydraulic brake failure
Estimated Time:1m 0s