Really interesting, thanks. It could be that mine have loosened so will have a look.

Did a quick google and found guide in case it's useful - https://www.audiworld.com/forums/a6-c7-platform-discussion-194/2015-caliper-guide-pin-bushing-corroded-2974183/

Thanks for the tip 👍🏻

but to be clear, it’s for the front calipers not the rear?

is it possible to have wobble and vibration from front but not feel it in the steering wheel?

I went through the same issue, I replaced the front discs twice, pads twice, and still got the vibration. I tried stepping hard on the brakes, my mechanic advised against that, he said the discs would heat distort and make it worse. The only solution was to change the bushings, it is easy to do, you can do it with the calipers on the car, just lift them off the carrier, a bit of manipulation, and then you can get the bushings out. To get them back in I used a clamp, the kind you squeeze with a pistol grip. This is WAY less expensive than changing discs and pads multiple times. The difference in friction between before and after on sliding the pins through the bushings was really significant.

That link shows exactly what to do, and yes, it is the front calipers, apparently Audi knows about this. I used a wire brush that is used for cleaning pipe fittings before soldering to get all the crud out of the caliper, and really greased the bushing and where it installs in the caliper to try to keep the water out.

The shake/wobble on my car was so severe I thought that people around me would notice!

Ok thanks 

will give it a try before go ahead and change everything 

On 2/10/2025 at 10:27 AM, cliffcoggin said:

When steel rusts it expands, thereby pushing adjacent parts away from each other. That's why rusty bolts are a swine to remove and brake discs are pushed out of alignment.

exactly clifford. i had to get the garage to free the caliper holding bolts as my snap on would not shift them and as above cleaned and sprayed the area

Edited May 27, 20251 yr by alpha omega

Keep us updated Gustaf. 

Does anyone know if the brake calipers are the same on all models?

I've got a 2015 BiTdi Allroad so trying to identify the correct parts for it.

Thanks

On 5/27/2025 at 11:45 AM, nitch said:

Keep us updated Gustaf. 

Does anyone know if the brake calipers are the same on all models?

I've got a 2015 BiTdi Allroad so trying to identify the correct parts for it.

Thanks

as I see it on Autodoc for example the spare parts are for all A6 C7 allroads.

Have a look at the caliper, and the bushings. My car is a 2016 (built in 2015) A6. I don't know if the calipers are the same, you could look up the parts breakdown on Audi site and see the part numbers for your car. Maybe the same or similar, but this is for sure the cause of the vibration in my car, I think the calipers could not slide easily, so that the brake effort needed was much higher, and the vibration was horrendous. 

Those bushings does not exist on my 2016 A6 Allroad

mine look like picture below but nothing wrong with them 

Together with by brother in law who is a professional mechanic, we measured the front left brake disc with an indicator gauge. The disc was a bit uneven I would say. And both discs had heat marks 

So changed the front discs and pads yesterday and now the vibration are gone.

I recommend the indicator gauge 😀👍🏻

Edited July 10, 2025Jul 10 by gurra76

For anyone that comes across this thread, I got to the bottom of it. It was a failed bushing in the lower control arms (banana arms). They're fluid filled and both had cracked and leaked their fluid. I hadn't noticed the knocking to be honest as it had been a gradual issue and I'd convinced myself it was a brake problem. I also thought it would have been noticed by the garage during service and MOT time.

Anyway, replaced the arms both side and the pulsing brake problem has gone. I did it myself so if anyone has any questions, let me know