Audi A6 2008 one pad wearing quickly at rear

Hi Folks I have a 2008 A6 2.0 tdi bre with E brake.

the passenger side inside (hidden pad) has worn down to the shim / back plate and is now grinding against the disc - the disc is shot.

The other pad on the outside has about 3mm wear left and the other side of the vehicle pads have about 4mm.

My assumption is that the passenger side caliper is sticking, is this something I can sort or will I need a replacement caliper?

(having a look it seems like I need a new caliper if anyone knows the spec for this car or has one for the rear P/S they want to sell let me know).

I need to fix this fairly soon as it sounds terrible when breaking, not that safe, metal filings sticking to wheel as well!

Any feedback appreciated!

Have you got VCDS or a similar tool as you need this to service the brakes.

You can get replacement pistons and seals along with new slider pins if your confident in replacing this.

You need to inspect the calliper to see if the sliders are ok or if the calliper piston is sticking.

If if you don't want to do this then it's a new calliper.

My my right rear calliper is doing this also, just got to inspect the pads regularly.

I just bought a piston kit around four hours ago.

Yes thank I have Rosstech - was a needed as I have a Passat B7 as well.

I had same symptoms as you well mainly accelerated wear on this inner pad - I last did the rear pads on 26th Nov 2016 so they have almost done a year. With it being out of view and my wives car it is hard to monitor.

How long are you getting from your pads normally?

I'm a bit worried about doing the rebuild kit, couple of reasons; in the past I've found that in this situation with other cars the piston has a bit of corrosion which mean replacing that as well. If it doesn't work the car which is a daily would be out of action and Rosstech recommends keeping the car hooked up to a 12v supply throughout (which I do with a smart charger).

What's your thoughts,

I tried ECP and car parts for less and looking about 180 - 225 for a replacement or a cheap German on on ebay for £130!

I need to change the fluid as well, any special procedure you follow?

3 or 4mm why were they not changed before this? New pads discs strip inspect and clean the sliders.

Dan can you post a link to where you got the rebuild kit was it just ebay - I tried GSF and ECP they don't do them anymore. I'm pretty sure I'll need a piston as well.
I have worries about undoing the bleed nipple if I go down the rebuild route.

My sliders were fully cleaned, inspected and greased with pagid lubrication (ceratec) on the last build in Nov 16 so certain its not the sliders and more likely a sticky piston.

Quote:

---

Originally Posted by swwalker

3 or 4mm why were they not changed before this? New pads discs strip inspect and clean the sliders.

---

Wear indicators come on on most cars at 2mm, average brake pad thickness of friction material is 12mm but varies so 3 to 4mm is leaving 1/4 to 1/3 of the pad life remaining any more is wasteful in normal operating circumstances IMO.

Have a read -

Access forbidden!

theres not many left

Audi A6 (C6) (07-11) rear brake caliper repair kit & piston (Elec H/B) PK232C | eBay

or

http://www.ebay.co.uk/itm/Audi-A6-C6...75.c100623.m-1

Thanks I got the PK138 variant with 41mm piston for my 1kd brake system in case anyone is interested.

On Friday night I will have a look and see if I can crack the bleed nipple and general state of play. If all is well I'll remove the calliper and change the seals on it. I noticed that a German kit comes with various other parts inc a bearing race I'm hoping that from past experience mine just has a rusty piston and damaged front seal.

If anyone knows any rebuild posts or videos for calipers with epb please let me know.

Any thoughts appreciated

when you take the caliper out take the motor off the back of the caliper and inspect the condition of the splined teeth on the drive for wear.

Also unscrew adjuster and clean up the threads.

http://i.ebayimg.com/images/g/IJQAAO...Z-/s-l1600.jpg

http://i.ebayimg.com/images/g/ieAAAO...Z-/s-l1600.jpg

There are plenty of posts on the YouTube

This one is very good Brake caliper rebuild - YouTube

This is a good page

TRW Electric Parking Brake EPB - KPS Automotive Parts

Thanks for both those links. I think that the thing that will probably grind me to a halt is the bleed screw and other bolts such as the motor ones!