I was getting a warning message on the screen (EPB malfunction, take to service), dashboard parking/brake icons illuminated and parking-brake button flashing.
After fiddling with the switch several times, and switching the engine on/off, I would get it to work, only to fail again some time time later.
When I got, I applied the parking brake no problem. Next day when I tried to drive the van, parking brake on with malfunction warnings.
Whatever I did, ignition on/off, disconnect battery, check fuses (BTW found known labeled EPB or similar), reset error codes, I could simply not clear the problem nor release the brakes.
Finally I had to physically remove both actuators from the back calipers and manually turn the shaft to release the brakes.
I tested the actuator motors on the bench, working fine (in both directions). They are only two cables to the motors, so I no control or end of travel sensores.
I presume that end of travelis detected by current surge.
Mechanically the actuating shafts (they push directly on the caliper piston) rotate freely, applying and releasing. When applied, it take some torque to release, but I think this is normal.
The actuators have reductions gears, providing ample torque.
So, I am assuming to mechanical issue on the brake end, nor electrical problems with the actuator motors themselves.
I cleaned the contacts and re-assembled the actuators (BTW, it seem different models for left and right brakes). The exposed cabling between the actuators and car body look in good shape.
Fuses have been checked, computer reset (by disconnecting battery) and error codes cleared, but problem persists
Given that the problem started intermittently, I'm inclined to think I have a wiring problem. But with no detailed wiring diagram, I have no idea where to check continuity and/or contacts and the engine end.
Any ideas, suggestions. Wiring diagram?
BTW, I hate EPB's. The good mechanical old brake handles worked perfectly, never saw an error code from one
, could be used as an emergency brake. Nothing more satisfying and assuring of pulling the lever and getting physical feedback of brakes on. Plus, can't do U'ies with the EPBThanks!