It can also slow down a wheel that is rotating faster than its partners. Once the pressure has been released, a pump quickly reapplies pressure and reactivates the brakes. When the computer senses that a wheel has slowed down more than the others (a condition that can lead to locking up), it commands a valve to momentarily release pressure to that wheel. Their job is to monitor the speed of each wheel and relay that data back to the control module. Wheel speed sensors are fitted in or near each wheel hub. In addition to the ABS computer control module, other specialized components are at play in the system. Your ABS is a computer-controlled safety system designed to prevent your wheels from locking up when you brake, no matter what surface you are driving over. While that might seem like an oversimplification (it is), in a similar way your steering has no effect if the tires are simply seized up and skidding ahead. No, the tires actually need to be moving. Sure, you can turn the wheel all you want, but the car will not head in that direction. Imagine if you tried to steer with your car standing still. For your steering wheel to have any effect, your tires need to be rolling. Not only does your car fail to stop when it is skidding, more importantly, you lose the ability to steer. No matter what you do with the steering wheel. Traction diminishes significantly and your car careens in the same direction you were traveling. When that happens, the amount of tire that is in contact with the road is reduced to a small patch of rubber. You hit the brakes, the calipers clamp down on the rotors, and the kinetic energy of your moving vehicle is converted to thermal energy, which, in turn, safely brings you to a stop.īut when you brake suddenly in an emergency, or on a slippery or uncertain surface, your wheels lock up and your tires begin to skid. The calipers squeeze your brake pads against the sides of spinning metal discs ( brake rotors) attached to the wheels. When you press on the brake pedal, a hydraulic pump forces fluid to the brake calipers, hydraulic clamping mechanisms located at each wheel. Your brake system relies on friction to slow and stop your vehicle. But what is that growling, rumbling, clicking sound? What is your brake system doing? And what, if anything, should you do so that the ABS will work the way it should? What is ABS? If you have ever stomped on your brakes and experienced a startling growl and a pulsing pedal, you know what Anti-Lock Brakes (ABS) feel like. If your life and the lives of your passengers were on the line, how fast is your foot? In contrast to outdated automotive braking habits, Anti-Lock Brakes (ABS) serve to protect you and your precious cargo by keeping your car in your control.
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