Electronic Parking Brake Actuator and Cable Mechanism Jamming
ModerateBrakesThe electronic parking brake (EPB) mechanism utilizes motorized cable pullers mounted underneath the rear floor pan. Moisture, road dirt, and winter salt spray penetrate the actuator casing and Bowden cables, causing internal corrosion of the gears and microswitches. This leaves the rear brakes locked on or triggers an instrument warning chime with a disabled parking brake, causing an MOT failure.
Warning message stating Check Parking Brake System illuminated on the multifunction display, Electric handbrake fails to disengage automatically when setting off in first gear, Loud screeching or grinding sound from underneath the rear floorpan when operating handbrake switch, Rear wheels remain partially locked or binding after releasing the parking brake
- Engage and release the parking brake switch multiple times with the engine idling on a slight incline
- Verify that the parking brake releases smoothly and quietly without warning chime alerts
- Inspect the rear brake cables underneath for torn rubber boots and corroded outer sleeves