The ABS controller powers on to self-test every time you turn on the ignition. This process repeats many times per second until the vehicle stops or you lift your foot off the brake pedal. The controller then directs a hydraulic valve to release some brake fluid pressure to the wheel in order to let it rotate again. What to Do When Your Hybrid or EV's Battery DiesĪBS sensors tell a computer (called a controller) when a wheel stops rotating while the car is in motion, which indicates that the brakes have locked up at that particular wheel.How to Wash Your Car Like a Pro in 12 Steps. ![]()
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