What causes the ABS and ESP engine yellow light to illuminate in a Mercedes-Benz?
1 Answers
Reasons for the ABS and ESP engine yellow light illuminating in a Mercedes-Benz: Dirty throttle body; Faulty brake switch and wiring; Malfunction in the intake system; Use of substandard fuel. Function of ABS: Maximize the effectiveness of the brakes, reducing braking time and distance. Effectively prevent vehicle skidding and fishtailing during emergency braking, ensuring excellent driving stability. Allow steering during emergency braking, maintaining good steering control. Avoid excessive friction between tires and the ground, reducing tire wear. Working principle of ABS: During braking, ABS rapidly determines the wheel lock-up state based on speed signals from each wheel speed sensor, closing the normally open input solenoid valve for the wheel that begins to lock, keeping the braking force constant. If the wheel continues to lock, the normally closed output solenoid valve opens, allowing the braking 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 at the optimal point (slip rate S of 20%), achieving the best braking effect and ensuring maximum driving safety.