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During braking, the Truck ABS modulator valve can quickly determine the locking state of the wheel according to the speed signal from each wheel speed sensor, and close the normally open input solenoid valve above the wheel that starts to lock the wheel, so that the braking force remains unchanged. If the wheel continues to lock, open the normally closed output solenoid valve, and the brake pressure on this wheel will drop rapidly due to the pipeline leading to the brake fluid reservoir, preventing the wheel from being completely locked due to excessive braking force. . When the braking state is always at the best point (slip rate S is 20%), the braking effect is the best and the driving is the safest.
The brake fluid in the front cavity of the master cylinder is dynamic pressure brake fluid, which pushes the reaction sleeve to the right, which in turn pushes the booster piston to move the brake pedal push rod to the right. Therefore, when the ABS is working, the driver can feel the vibration of the pedals and hear some noises.
After the car decelerates, once the ABS computer detects that the wheel lock state disappears, it will let the main control valve close, so that the system will work in a normal braking state. If the pressure in the accumulator falls below the safe limit, the red brake fault indicator light and the amber ABS fault indicator light come on. In this case, the driver needs to perform a deep pedal-type braking method with greater force to effectively brake the front and rear wheels.
