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Question

Difficulty: HardBrake Failure Management

You are driving at 35 mph on a flat city roadway approaching a congested intersection when your foot brake pedal suddenly sinks completely to the floor, providing no resistance or stopping power. What is the correct initial sequence of actions you should take to safely bring the vehicle to a stop?

  1. Pump the brake pedal rapidly several times, shift to a lower gear, and gently apply the parking brake while holding the release mechanism.Answer
  2. B
    Turn off the ignition immediately to stop engine power, steer onto the shoulder, and pull the parking brake handle up as hard as possible.
  3. C
    Shift the transmission directly into Park to lock the drive shaft, then pump the foot brake repeatedly.
  4. D
    Press the foot brake pedal down firmly and hold it at the floor while rapidly swerving from side to side to dissipate speed.

Answer

The driver should pump the brake pedal rapidly, downshift to a lower gear, and carefully apply the parking brake without locking the wheels.
Pumping the brake pedal can rebuild hydraulic pressure, downshifting provides engine braking, and modulated use of the parking brake slows the vehicle safely without causing wheel lockup or steering loss.

Step-by-Step Solution

1
Pump the brake pedal rapidly several times.
Attempts to build up enough temporary hydraulic pressure to regain braking action in a dual-circuit brake system.
Faulty or leaked brake fluid lines may still retain enough pressure in one circuit if pumped quickly.
2
Shift the transmission into a lower gear.
Engages engine braking to slow down momentum naturally.
Lower transmission gearing forces the engine RPM to assist in reducing road speed safely without locking wheels.
3
Apply the parking brake gradually while keeping the release button depressed.
Provides mechanical braking force to the rear wheels.
Modulating the parking brake prevents the rear wheels from locking up and causing a skid.

Key Concept

Brake Failure Recovery Procedure
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Topics

Brake Failure Management

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