When the vehicle speed goes below 20 km/h (12 mph), the ABS turns off.His invention was originally called Antiskid, and when it was sold to Bosch, that company renamed it ABS or anti-lock braking system. The father of the modern anti-lock braking system was Mario Palazzetti, who worked for Fiat. This is a normal function of the self-check by the anti-lock brake control module. Anti-lock brakes came out and were becoming widely used by the 1970s. 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.Increased stopping abilities: Their primary purpose is to prevent your wheels from locking up and minimize slipping, keeping in mind that all roads. 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. Greater traction control: The advanced traction control technology and the anti-lock brake systems share basic designs ensuring your wheels have excellent grip.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. While the technology continues to advance, the basic premise is that an anti-lock braking system can sense individual wheel speeds, which means it knows.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.Anti-Lock Brake Systems (ABS) Operate as Follows
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