Does the ABS self-check make noise every time you start the car?

[Bethany]

The sound of the ABS system self-check cannot be eliminated. This is a normal sound, as it pumps oil every time it operates, and this cannot be removed. Relevant details are as follows: 1. ABS: ABS (Anti-lock Braking System) prevents wheel lock-up by using sensors installed on the wheels to detect when a wheel is about to lock. The controller then instructs the regulator to reduce the hydraulic pressure in that wheel's brake cylinder, decreasing the braking torque. After a short period, the original hydraulic pressure is restored. This cycle repeats (up to 5~10 times per second), ensuring the wheels remain rotating while maintaining maximum braking torque. 2. Skidding: In cars without ABS, if the brake pedal is pressed hard while driving, the wheel speed rapidly decreases. When the braking force exceeds the friction between the wheel and the ground, the wheel locks up. A fully locked wheel reduces the friction between the tire and the road. If the front wheels lock, the driver loses control of the vehicle's direction. If the rear wheels lock, skidding is highly likely to occur.