How Does The Anti-lock Brake System Work?

- May 24, 2019-

How does the anti-lock brake system work?

When braking, ABS can quickly determine the locked state of the wheel according to the speed signal transmitted by each wheel speed sensor. Close the normally open input solenoid valve on the wheel to stop the brake force, if the wheel continues When it is locked, the normally closed output solenoid valve is opened. The brake pressure on this wheel is quickly moved down due to the passage of the through brake fluid reservoir, preventing the wheel from being completely locked due to excessive braking force. When the braking state is always at the optimum point (slip rate S is 20%), the braking effect is best and the driving is safest.

The brake fluid in the front chamber of the master cylinder is a dynamic pressure brake fluid that pushes the reaction sleeve to the right, which in turn pushes the booster piston to move the brake pedal pusher to the right. Therefore, when the ABS is working, the driver can feel the pedals vibrating and hear some noise.

After the car decelerates, once the ABS computer detects that the wheel lock state has disappeared, it will cause the main control valve to close, allowing the system to switch to normal braking conditions. If the accumulator pressure drops below the safe limit, the red brake fault indicator and the amber ABS fault indicator light. In this case, the driver must perform a deep pedal-type braking method with a large force to effectively brake the front and rear wheels.