Brakes
ABS (ANTI LOCK BRAKING SYSTEM)
The system works by sensing abnormally fast deceleration of the wheel, such as in an emergency braking situation. The ABS limits the fluid pressure so as to avoid the wheel locking up and causing a skid. Under emergency braking the ABS will rapidly pump and shut off the fluid at more than ten times a second and you will feel a dramatic vibration on the foot pedal, this is normal and indicates the system is working. This should not be confused with brake judder under normal braking which would indicate a fault with the discs.
The ABS tests itself each time the ignition is turned on, if a failure is sensed the warning light on the dashboard will come on and the car should be checked immediately.