When driving in the rain or on wet roads, a car's Brake Disc Wiping (BDW) system washes away the film of water that can build up on the brake discs. When the wipers on the windshield are turned on, the mechanism is triggered. If the driver does not brake within five minutes, the system will gently press the brake pads against the disc to wipe away the water film that has formed. The driver is unaware of the procedure, which comes to a halt when the windscreen wipers are turned off. When the brakes are truly needed, keeping the brake disc clear of water increases braking performance.
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