What Causes the ABS and Anti-Skid Lights to Illuminate?

[Wren]

ABS and anti-skid lights may illuminate due to faults in components such as wheel speed sensors, ABS wiring, ABS pump, pressure regulating solenoid valves, or the ABS computer. How ABS Works: During braking, the ABS rapidly determines wheel lock-up status based on speed signals from each wheel speed sensor. It closes the normally open input solenoid valve for the locking wheel to maintain braking force. If the wheel continues to lock, the normally closed output solenoid valve opens, allowing brake pressure to rapidly decrease through a direct connection to the brake fluid reservoir, preventing complete wheel lock-up from excessive braking force. This keeps braking at the optimal point (20% slip rate S) for maximum braking effectiveness and driving safety. Functions of ABS: • Maximizes brake effectiveness, reducing braking time and distance • Effectively prevents vehicle skidding and fishtailing during emergency braking, ensuring good driving stability • Allows steering during emergency braking, maintaining good steering control • Avoids severe friction between tires and road surface, reducing tire wear