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Difficulty: MediumBraking Systems and ABS

While travelling on a clear, dry road, the anti-lock braking system (ABS) warning light on the instrument panel stays lit after the engine has started. What does this warning light indicate to the driver?

  1. A
    The primary hydraulic braking system has suffered complete failure and the footbrake will no longer slow the vehicle down.
  2. The ABS has developed a fault and will not assist, although normal conventional braking remains operational.Answer
  3. C
    The road wheels have locked into an ongoing skid and immediate counter-steering is required.
  4. D
    The overall stopping distance will automatically remain unchanged even on standing water without driver adjustments.

Answer

The ABS has developed a fault and will not assist, although normal conventional braking remains operational.
When the anti-lock braking system (ABS) warning light remains illuminated while driving, the vehicle's onboard diagnostic system has detected a fault and disabled anti-lock modulation. The standard hydraulic braking system continues to function normally as conventional brakes, but the vehicle should be inspected by a qualified mechanic promptly.

Step-by-Step Solution

1
Identify the meaning of an illuminated dashboard ABS warning light during normal driving.
Recognise that an internal diagnostic fault has been detected within the anti-lock circuitry or wheel-speed sensors.
Vehicle warning systems illuminate specific amber warning lamps when supplemental safety aids fail their self-check.
2
Determine the impact of an ABS failure on standard hydraulic braking capability.
Confirm that standard friction brakes continue to operate as conventional brakes without computer-controlled anti-lock pulsing.
The mechanical hydraulic brake circuit is designed to function independently of electronic anti-lock modulation.

Key Concept

Anti-lock Braking System (ABS) Warning Lamp Operation and Fallback Braking
Estimated Time:1m 0s
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Topics

Braking Systems and ABS

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