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ABS (anti-lock) brakes and TCS

An anti-lock braking system (ABS) detects when a wheel locks and starts to skid. The system then ‘pumps’ the brake (applying and releasing it) at a much quicker rate than the driver can.

  • ABS brakes prevent skidding, reduce the stopping distance and allow the car to be steered around an obstacle it would otherwise hit.

Some facts about ABS:

  • The system isn’t automatic – it works only when the brakes are on. Its activated by pressing the brake quickly and firmly, and maintaining pressure.
  • Pumping or easing off the brakes, which good drivers do to avoid skidding, stops ABS from working.
  • ABS will not prevent skids on corners caused by excessive speed. You should never drive faster or follow other cars more closely because you’re in a car with ABS.
  • Your stopping distance tends to be shorter on wet and slippery roads, but can actually increase on shingle or soft snow.
  • When ABS brakes are activated, the brake pedal may vibrate or there may be a thumping noise.

In a car without ABS, you could correct a potential skid by pumping the brake. But in practice this is hard to do and most drivers will skid. It’s a good idea to do a practical driving course to become familiar with ABS.

A traction control system (TCS) is an enhanced version of ABS, which improves traction on slippery surfaces when accelerating.

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