وحدة تحكم مكابح الركن معيبة

The module operating an electric parking brake, faulty so the brake cannot be applied or released. The failure that matters is a brake stuck on, which immobilises the vehicle, and it is why these systems carry a documented emergency release.

Rule out the actuators and their inputs first. Each rear caliper has its own motor, and a seized motor or corroded connector produces module-level faults; the module also needs the brake pedal switch and often the inclination sensor. A brake that releases on one side and not the other is an actuator, not the module — a distinction visible from the vehicle's behaviour.

Service mode is the practical point. These calipers must be retracted electronically before pads can be changed, and winding one back mechanically damages the mechanism — a park brake fault appearing immediately after a pad change is usually that. Recalibration after any work is required on most systems, and skipping it leaves the module unable to judge its own travel.