Why does Volkswagen's parking brake and ABS fail?
3 Answers
Reasons for Volkswagen parking brake and ABS failure: Wheel speed sensor, ABS wiring, ABS pressure regulating solenoid valve, ABS computer failure; insufficient brake fluid; dirty ABS sensor. The method to eliminate the ABS warning light is to unplug the ABS power supply in the engine compartment. Function of ABS: Maximize the effectiveness of the brakes, shorten braking time and distance. Effectively prevent vehicle skidding and fishtailing during emergency braking, ensuring good driving stability. Allow steering during emergency braking, providing good steering maneuverability. Avoid severe friction between tires and the ground, reducing tire wear. Working principle of ABS: During braking, ABS quickly determines the wheel lock-up state based on speed signals from each wheel speed sensor, closes the normally open input solenoid valve on the wheel that is starting to lock, keeping the braking force unchanged. If the wheel continues to lock, the normally closed output solenoid valve is opened, causing the brake pressure on that wheel to rapidly decrease due to the direct connection to the brake fluid reservoir, preventing complete wheel lock-up from excessive braking force. This keeps the braking state always at the optimal point (slip rate S of 20%), achieving the best braking effect and the highest driving safety.
