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Question

Difficulty: EasyBrake Failure

A truck driver slowing down for an urban intersection presses the brake pedal and feels it sink straight to the floor without generating resistance or deceleration. If the vehicle is equipped with hydraulic brakes, which initial action should the driver take to attempt to restore stopping power?

  1. A
    Hold the brake pedal firmly against the floorboard and wait for the pushrods to self-adjust.
  2. Pump the brake pedal rapidly to rebuild hydraulic pressure within the lines.Answer
  3. C
    Activate the engine retarder on maximum power and shut off the ignition switch immediately.
  4. D
    Shift the transmission into neutral and wait for rolling resistance to stop the vehicle.

Answer

Pump the brake pedal rapidly to rebuild hydraulic pressure within the lines.
Pumping the brake pedal rapidly generates and accumulates hydraulic pressure in the system, which often restores sufficient braking force to bring the vehicle to a halt.

Step-by-Step Solution

1
Identify the brake system type and the specific failure symptom.
The vehicle uses hydraulic brakes and the pedal drops completely to the floor, indicating loss of hydraulic pressure.
Correct emergency response depends on distinguishing hydraulic system behavior from air brake system behavior.
2
Apply the primary emergency procedure for hydraulic pedal drop.
Pumping the brake pedal rapidly creates pressure in the system.
In many hydraulic brake failure events, rapid pumping generates enough fluid pressure to actuate the brakes and bring the vehicle to a controlled stop.

Key Concept

Hydraulic Brake Failure Emergency Response
Estimated Time:45s
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Topics

Brake Failure

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