What Causes the Electronic Parking Brake to Make Noise?
2 Answers
The noise from the electronic parking brake may be due to a malfunction in the electronic parking brake system. Below is an introduction to issues related to the electronic parking brake system: 1. Identifying the Fault: Since an electronic parking brake malfunction could involve multiple components such as the wheel speed sensor, throttle position sensor, parking brake switch, wheel speed sensor, or motor, any abnormality in these parts might cause the EPB light to illuminate. It is recommended that car owners have the issue diagnosed at a repair shop, where a fault diagnostic tool can quickly and accurately pinpoint the source of the problem. 2. Technology: The electronic parking brake is a technology that achieves parking braking through electronic control. Its working principle is the same as that of a mechanical handbrake, both relying on the friction generated between the brake disc and brake pads to control parking braking. The only difference is that the control method has shifted from a mechanical handbrake lever to an electronic button. 3. Application: The electronic parking brake has evolved from basic parking functions to include the automatic parking function AUTO-HOLD. The application of AUTO-HOLD automatic parking technology allows drivers to avoid prolonged braking when the vehicle is stationary. With the automatic electronic parking brake engaged, unnecessary vehicle slippage can be prevented—simply put, the vehicle won't roll backward.
After driving for so many years, electronic parking brake noise is indeed quite common. Usually, it's due to mechanical wear or lubrication issues, like the gear set squeaking from lack of oil. Aging cables can also produce metallic grinding sounds, especially noticeable in rainy weather with rust. Pebbles stuck between the brake disc and pad or loose brake pad springs can cause metal friction sounds when releasing the handbrake. Motor failures are less common, but a squeaky current sound might indicate a bad motor bearing. The most annoying issue is the parking brake repeatedly self-checking due to a computer program error, producing irritating clicking sounds. I suggest not tinkering with it yourself—first, go to a repair shop to read the fault codes. Replace the gears if needed, or clean off the rust. Delaying repairs can easily burn out the motor, and replacing the whole set will be even more painful.
