While changing the rear brake pads on my wife's 2009 Passat ( with
Electronic E Brakes ) I inadvertently ( Stupidly ) opened the brakes when the caliper was not seated on the rotor. I had followed the VAG-Com directions to cycle the EPB before doing the "Open Rear Parking Brake" procedure and heard the brakes open, but when I went to put in the new pads the piston wasn't open far enough to seat properly. At the time I didn't know you needed to use a clamp to push it back and thought there was something wrong, so I tried to cycle the brakes open and close again with the caliper loose from the rotor. That's where I got into trouble.
Now my E Brake light is on and the E Brake warning light is flashing when I turn the key to the on position. When I try to use the VAG-Com I can't perform any of the "basis settings" as the software gives me a message that group 006, 007 and 010 are "not available." I ran a diagnostic test and here's what came back:
1 Fault found:
02428 - Left Parking Brake Motor (v282) Clamping Force Not Reached
000 - - - MIL ON
Fault status: 11110000
Fault priority: 3
Fault Frequency: 1
Reset counter: 161
Mileage: 73381 km
Time Indication: 0
Voltage: 12.00 v
Speed: 0.0 km/h
Hex Value: 0x1261
Hex Value: 0x0001
Hex Value: 0x0810
In frustration, I went to "JustAnswer.com" and tried to get help from a VW Mechanic and here's what he said to do.
You have received an Answer!
From gomi_otaku Wednesday, October 26, 2011 7:55 PM EST
What you need to do now, is to unbolt the motor from the back of the caliper- it is held on with two Torx screws. Once you remove that, you will see that the shaft of the motor is a large Torx style end itself, and you can rotate the piston in and out using a large Torx head on a ratchet. You will need to compress the piston carefully, until it starts to engage the bore, then start to slide it in carefully until it stops- at that point, it should be against the motor drive cam, and if you rotate it you should be able to either feel it try to push out further, or relax and allow you to compress it in.
I followed these directions, but when I used the triple square socket to manually turn the piston it doesn't move. Using a "C" Clamp to compress it while turning the socket doesn't work either.
I have the caliper sitting on my work bench with the motor removed and need help figuring out how to get the piston to retract. If anyone can help me I'm all ears and appreciate your help greatly.