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Rear brake pad replacement

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Old 04-11-2014, 10:05 AM   #1
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Default Rear brake pad replacement

I used vcds to open the piston, but know I can not move the caliper in to replace the pads.

Any ideas?
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Old 04-11-2014, 10:11 AM   #2
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It only winds in the EPB, it doesn't PULL the pison back.
You may now have to lever against the carrier and pad or some such to push it back hydraulically as with conventional brakes. You may also need to use a wind back tool in non-rotating mode or G clamp to get it back enough to install new pads.
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Old 04-11-2014, 10:19 AM   #3
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Quote:
Originally Posted by snapdragon View Post
It only winds in the EPB, it doesn't PULL the pison back.
You may now have to lever against the carrier and pad or some such to push it back hydraulically as with conventional brakes. You may also need to use a wind back tool in non-rotating mode or G clamp to get it back enough to install new pads.
I applied a-lot of pressure to the piston and no movement. It's a 2006 A8L, I'm not sure if I would need a tool to wind the piston back in.
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Old 04-11-2014, 10:24 AM   #4
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Default Please shoot some pictures - I'm going to do mine soon

Hope you get the job done without any problems.

Cheers,

Louis
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Old 04-11-2014, 10:30 AM   #5
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Quote:
Originally Posted by snapdragon View Post
It only winds in the EPB, it doesn't PULL the pison back.
You may now have to lever against the carrier and pad or some such to push it back hydraulically as with conventional brakes. You may also need to use a wind back tool in non-rotating mode or G clamp to get it back enough to install new pads.
I applied a-lot of pressure to the piston and no movement. It's a 2006 A8L, I'm not sure if I would need a tool to wind the piston back in.
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Old 04-11-2014, 10:31 AM   #6
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Default Something is wrong--it should wind it back in and fully release pads...

I have had my pads (2006) out to change at least three time now. When I use VAG COM/VCDS, it definitely winds everything to full open on mine, piston absolutely included, and the new pads slip right in. No prying, no turning, no special tricks.

Having owned the C5 and C4 with the auto parking brake adjust rear calipers when they still used manual cables, I definitely know about the "old" need to wind things in, but the D3 set up isn't like that. Sounds like something isn't working as designed.
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helpful cross reference to a C6 post with MMI and other TSB's that also cover D3 A8's.


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Old 04-11-2014, 10:45 AM   #7
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Default This is nice to know... But

Quote:
Originally Posted by MP4.2+6.0 View Post
I have had my pads (2006) out to change at least three time now. When I use VAG COM/VCDS, it definitely winds everything to full open on mine, piston absolutely included, and the new pads slip right in. No prying, no turning, no special tricks.
Everyone seems to have different problems with pistons retracting. Did anyone did a write up with pictures and videos on these eBrakes? For some reasons, my rear brakes haven't thrown a warning yet, I'd replaced the front already - both of the brakes were replaced at 55k miles and now it's 90k miles.

Cheers,

Louis
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Old 04-11-2014, 11:02 AM   #8
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VDCS should retract pads. BUT on my 2004 I was able to turn the piston to make it retract. BUT don't turn the rubber seal just the piston.
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Old 04-11-2014, 11:04 AM   #9
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Quote:
Originally Posted by MP4.2+6.0 View Post
I have had my pads (2006) out to change at least three time now. When I use VAG COM/VCDS, it definitely winds everything to full open on mine, piston absolutely included, and the new pads slip right in. No prying, no turning, no special tricks.

Having owned the C5 and C4 with the auto parking brake adjust rear calipers when they still used manual cables, I definitely know about the "old" need to wind things in, but the D3 set up isn't like that. Sounds like something isn't working as designed.
I agree, there is definitely something wrong. I can here the motors retracting the brake, but the piston barely comes of the disc.
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Old 04-11-2014, 11:54 AM   #10
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Side note! The parking brake malfunction light was on before I started. The EPB would set and release but the light stayed on.
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Old 04-11-2014, 12:39 PM   #11
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Maybe the piston is seized? One of mine was, but was moveable manually.
Needed a new seal and dust cover and cleaning up with 2500 wet & dry in the sink.
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Old 04-11-2014, 03:31 PM   #12
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Quote:
Originally Posted by snatchman View Post
Side note! The parking brake malfunction light was on before I started. The EPB would set and release but the light stayed on.
Are you sure that both sides are working? One may be seized or have a loose contact. Do you have problem with retracting pistons on both sides, or may be just on that seized side?

2005 won't retract electrically. After VCDS retracting I have to push them in using C-clamp.
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Old 04-11-2014, 03:53 PM   #13
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Quote:
Originally Posted by mishar View Post
Are you sure that both sides are working? One may be seized or have a loose contact. Do you have problem with retracting pistons on both sides, or may be just on that seized side?

2005 won't retract electrically. After VCDS retracting I have to push them in using C-clamp.
I watched both sides during the retracting process. I could here both motors but neither piston moved. I tried pushing them in with a C-clamp but neither budge.
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Old 04-11-2014, 04:59 PM   #14
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For how long that retraction lasts?
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Old 04-11-2014, 05:13 PM   #15
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Quote:
Originally Posted by mishar View Post
For how long that retraction lasts?
About 15 to 20 sceonds.
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Old 04-11-2014, 05:22 PM   #16
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That should be enough. You may unscrew motors, check if everything is OK there and try retracting brakes by manually turning it.
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Old 04-11-2014, 05:55 PM   #17
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Quote:
Originally Posted by mishar View Post
That should be enough. You may unscrew motors, check if everything is OK there and try retracting brakes by manually turning it.
Any instructions on how this should be done would be greatly appreaciated.
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Old 04-12-2014, 09:57 AM   #18
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Thanks all for your help. I completed my first rear brake job on my 06 A8l. During my second attempt the passenger piston went in fairly easy with a C-clamp, the driver side was a little bit more difficult. I had to apply pressure with the C-clamp and turn the caliper slightly with channel locks, then the piston retracted with just the C-clamp.

The Ross Tech tool has officially paid for itself.
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Old 04-12-2014, 09:57 AM
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