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When would an anti-lock braking system start to work?*

A Just as the wheels are about to lock
Explaination
The anti-lock braking system has sensors that detect when the wheels are about to lock. It releases the brakes momentarily to allow the wheels to revolve and grip, then automatically reapplies them. This cycle is repeated several times a second to maximise braking performance.
B After the parking brake has been applied
C Whenever pressure on the brake pedal is applied
D When the normal braking system fails to operate