The ABS system ensures that the car remains steerable during an emergency stop. The ABS controls the braking electronically. Sensors in the wheels monitor whether a wheel is about to block. If so, ABS will briefly reduce the braking force on that one wheel. As soon as that wheel regains traction – so the same rotational speed as the other wheels – the system builds up the brake pressure again. This process repeats itself continuously (at least ten to fifteen times per second).
Is the ABS light on?
ABS consists of four parts: sensors, valves, a pump and a control unit. The sensors, in particular, can become dirty, making them unable to properly measure the rotational speed of a wheel. Then the ABS light will illuminate on the dashboard. Cleaning the sensors is usually the remedy. The sensors can also fail from exposure to heat, moisture and dirt. In that case, they must be replaced. Pump and control unit can also break. Naturally, they must, therefore, be renewed.