What are the possible causes of EPB failure?

[OLevi]

There may be an issue with the electronic parking brake. Below is relevant information: Introduction: EPB stands for Electrical Park Brake, which is the electronic parking brake system. The electronic parking brake system relies on electronic control and uses a longitudinal acceleration sensor to calculate the slope. When an EPB failure occurs, you can press the foot brake down while also pressing the handbrake down, hold for about 20 seconds, and then lift the handbrake up to restore normal operation. Advantages of EPB: It replaces the traditional mechanical lever and tire cables, providing better assistance to the driver. The electronic parking brake button, which replaces the traditional lever handbrake, is safer than the traditional lever handbrake. The braking effect is not affected by the driver's force, turning the traditional lever handbrake into an easily accessible button.

[Malachi]

I just encountered the EPB warning light issue two days ago and found it was caused by poor contact in the control button. These electronic parking brakes have super sensitive circuitry - even slight brake pad wear can trigger false alarms. I remember one time after driving in snow, melted snow water seeped into the caliper and caused it to freeze in position. If fault codes appear frequently, there's an 80% chance it's either the motor module or body control computer acting up. My advice? Avoid power washing near the wheel hubs during car washes - sand and debris getting into the EPB module can cause short circuits. Most importantly, never tow a car with the parking brake engaged - that can fry the electronics in minutes, with repair costs high enough to buy new tires.

[MacLaila]

I've found that insufficient battery power often causes EPB malfunctions, especially with significant voltage fluctuations in winter. Last year, a vehicle's electronic parking brake completely failed, and upon disassembly, it was discovered that the cable mechanism was rusted and jammed. During daily use, it's important to pay attention to dashboard warnings, as the system sometimes misjudges the tilt angle and automatically locks. The most common issue I've encountered is when the brake pads wear down to the warning level, causing the EPB sensor to give false alarms. If you hear a metallic grinding noise from the rear wheels, it's most likely that the brake pads are completely worn out. In such cases, it's best to replace the pads promptly, otherwise even regular braking performance will be affected.

[SanAyla]

EPB failures mostly occur in the electrical system. Water ingress into the control unit can paralyze it—I've encountered multiple cases where it suddenly failed after driving through water in rainy conditions. It's also common for wheel speed sensors to get clogged with mud, preventing the system from accurately detecting wheel status. Additionally, improperly installed audio system wiring during modifications is particularly hazardous, as it can easily interfere with the EPB's communication signal lines. Special reminder: Pay attention to loose battery terminal connections, as sudden power loss may cause the electronic parking brake to get stuck in the engaged position.

[CamillaRose]

After the vehicle warranty expires, the EPB is prone to issues. I've seen cases where the electronic switch contacts oxidize, causing no response when pressed; and also instances where the actuator motor overheats, which can happen during prolonged parking on steep slopes. Improper operation can easily lead to malfunctions, such as pressing the button before the vehicle comes to a complete stop, which can confuse the sensors. It's recommended to let the EPB operate for a while before turning off the ignition each time, allowing the system to complete its self-check procedure.