Do I need to replace all 4 ABS sensors if they are broken on a Mercedes-Benz?

[ClaytonLynn]

Mercedes-Benz ABS sensors only need to be replaced in pairs when they fail. 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. It closes the normally open input solenoid valve for the wheel that is starting to lock, keeping the braking force constant. If the wheel continues to lock, the normally closed output solenoid valve opens, causing the braking pressure on that wheel to drop rapidly due to the direct connection to the brake fluid reservoir, preventing the wheel from fully locking due to excessive braking force. This keeps the braking state at the optimal point (slip rate S of 20%), achieving the best braking performance and maximum driving safety.