When the vehicle speed goes below 20 km/h (12 mph), the ABS turns off.This is a normal function of the self-check by the anti-lock brake control module. At this time, a mechanical noise may be heard. Each time the vehicle is driven, as soon as vehicle speed reaches approximately 20 km/h (12 mph), the anti-lock brake control module turns on the pump motor for approximately one-half second.During vehicle operation, including normal and anti-lock braking, the anti-lock brake control module monitors all electrical anti-lock functions and some hydraulic operations.When the ignition switch is turned to the RUN position, the anti-lock brake control module will perform a preliminary self-check on the anti-lock electrical system indicated by a three-second illumination of the yellow ABS wanting indicator. [li[The 4-wheel anti-lock brake system is self-monitoring. Loss of hydraulic fluid in the brake master cylinder will disable the anti-lock system.However, normal power-assisted braking remains. Malfunction of the anti-lock brake system will cause the anti-lock brake control module to shut off or inhibit the system.The anti-lock brake control module monitors the electromechanical components of the system.Once the affected wheel comes back up to speed, the anti-lock brake control module returns the solenoid valves to their normal condition allowing fluid flow to the affected brake.If that wheel is still decelerating, it opens the solenoid valve for that circuit.The anti-lock brake control module then looks at the anti-lock brake sensor signal from the affected wheel again.This prevents any more fluid from entering that circuit. If the anti-lock brake control module senses a wheel is about to lock, based on anti-lock brake sensor data, it closes the normally open solenoid valve for that circuit.The secondary (front) circuit of the brake master cylinder feeds the rear brakes.The primary (rear) circuit of the brake master cylinder feeds the front brakes.This pressure is transmitted through four normally open solenoid valves contained inside the HCU, then through the outlet ports of the HCU to each wheel. When the brakes are applied, fluid is forced from the brake master cylinder outlet ports to the HCU inlet ports.In normal braking conditions, this process happens over a prolonged time frame, and the wheels don't lock as the brakes are applied gradually.Anti-Lock Brake Systems (ABS) Operate as Follows When you apply the brakes on your vehicle, this kinetic energy converts into heat, and once all the kinetic energy is consumed, the car comes to a stop. Well, when your car is moving at a high velocity, it has a lot of kinetic energy, and the same needs to be converted into another form of energy to stop the vehicle. This raises questions: why do tires lock during braking, and why is this phenomenon so dangerous? Invented by Mario Palazzetti in 1971, the Antilock Braking System is an old safety standard when compared to newer automated vehicle safety technologies, but according to a US Department of Transportation study of accidents between 19, ABS was estimated to have reduced non-fatal accidents by six percent in cars. Short for Antilock Braking System, ABS is a braking technology that prevents your tires from locking during emergency braking. So, what is ABS, and how does it enable drivers to control their vehicles in situations of emergency? Let's talk about ABS and how it works.
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