What is the situation with the ABS return pump failure?
3 Answers
ABS warning light illumination is related to many factors. The sensing part of the ABS speed sensor may be covered by dirt, mud, or other contaminants, affecting the sensor's ability to detect the corresponding speed signal. This prevents the ABS computer from determining the vehicle speed and the wheel slip rate, and thus cannot issue appropriate commands to regulate braking. In this case, simply cleaning the dirt from the speed sensor and adjusting the gap between the speed sensor and the signal ring can restore normal function. More related information is as follows: 1. The ABS light may also illuminate: If the speed sensor is damaged, the ABS light will also illuminate, requiring replacement of the ABS sensor. 2. Due to loose connections in the ABS wiring or internal faults in the ABS pump, the ABS light may also illuminate. This fault requires a comprehensive inspection. When the ABS warning light is illuminated, it does not affect the normal operation of the vehicle, but the ABS anti-lock function will be disabled.
I've encountered ABS return pump failure many times, let me share some insights as an experienced driver. The most obvious symptom is the brake pedal becoming stiff and hard to depress, with the ABS warning light definitely illuminated on the dashboard. The main causes are either a burnt-out motor, worn carbon brushes, or stuck valve bodies. This is especially dangerous when driving in rain as wheels are prone to locking up and skidding. My suggestion is to first check if the fuse is blown, then verify whether the relay is functioning properly. Don't delay fixing this issue - a fellow driver recently almost rear-ended someone on the highway due to delayed repairs. Replacing the pump costs around 2,000 yuan, but safety should always come first.
Having worked in auto repair for over a decade, ABS return pump failures are quite common. Typical symptoms include the brake pedal kicking back when pressed, accompanied by a buzzing sound during pump operation. There are three root causes: short-circuit burnout of the pump motor coil, control valves jammed by debris, or corroded wiring connections causing poor contact. When encountering this issue, immediately take the vehicle to a shop for diagnostic trouble code reading—don't attempt disassembly yourself. I once dismantled a BMW ABS pump, and brake fluid sprayed everywhere, creating a huge mess. The key is regular brake fluid replacement; every two years is ideal, as this prevents the return pump's valve body from sticking easily.
