However, because of the ABS, the tire slows down at the same rate as the vehicle. The controller will then use a pump to increase pressure again until the wheel decelerates again. When the ABS controller detects rapid deceleration or an emergency stop, it uses a valve in the brake line to reduce pressure to the wheel. The ABS controller is always looking out for rapid deceleration, an early signal for wheel lock. The system relies on sensors that constantly monitor the speed of the vehicle’s wheels. The ABS comprises wheel speed sensors, an electronic control unit (ECU), valves, and a pump. Today, ABS does this for drivers, only faster and more accurately. ![]() An overview of how ABS worksīefore anti-lock brakes, drivers were taught to “pump their brakes” when they start to skid on slippery roads. But on slippery surfaces, ABS activated by hard braking may increase stopping distance while allowing drivers to keep steering control. On most surfaces, a vehicle equipped with ABS will likely stop faster than one without. However, ABS doesn’t necessarily shorten a vehicle’s stopping distance. ABS is particularly important for controlling wheel speed on loose gravel or slippery surfaces. Without the ABS, drivers can lose steering control of their vehicles while skidding and potentially overturn. The ABS allows drivers to retain more control of the vehicle by modifying brake pressure. ![]() The ABS senses when wheels are about to lock during an emergency braking situation and releases enough brake force to maintain traction with the road surface. ![]() It is a safety feature that prevents wheels from locking up while braking to avoid skidding.ĪBS consists of computer sensors and solenoid valves which monitor wheel speed.
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