Why does the ABS sensor fail?

[McCharlie]

ABS sensors can fail due to poor driving habits and substandard component quality. Precautions for using ABS: When driving on good road surfaces, maintain sufficient braking distance; avoid repeatedly pressing the brake pedal. Solutions for a faulty ABS sensor: Check the fluid level in the master cylinder reservoir; perform fault self-diagnosis; inspect the ABS ECU power circuit; check the ABS ECU grounding condition; examine the electric return pump relay and its wiring; inspect the electric return pump motor and its wiring. How ABS works: During braking, ABS quickly determines wheel lock-up based on speed signals from each wheel speed sensor, closing the normally open input solenoid valve on the locking wheel to maintain braking force. If the wheel continues to lock, the normally closed output solenoid valve opens, allowing brake pressure on that wheel to rapidly decrease via a direct path to the brake fluid reservoir, preventing complete wheel lock-up due to excessive braking force. This keeps braking at the optimal point (20% slip ratio S), ensuring the best braking performance and maximum driving safety.