Ok just changing the brake pads on my brothers 2001 A4 quattro. Well fronts went fine, rear not so much. I have a tool to screw in the rearpiston but when i screw it clockwise the piston doesnt go in at all, it just stays in the same place(observed by putting the old pads back on and the caliper fitting same way as removed, if maybe a cm of extra room). No matter how much i screw it in the puston just stays put. If i screw ccw, the piston will actually come out even further, and can then be screwed in the same amount. Im using a pretty good amount of pressure(although its very awkward arrangement), not sure if i need more force. I have also cracked the bleader valve to relieve any pressure that could be stopping movement, no luck there either.

Soo any tips, advice, spoilers greatly appriciated.

Thanks

 

This is a remote chance, but the bleeder could be screwed up. Take off the brake fluid reservoir cap instead (just don't hit the pedal without putting it back on first). See if that helps you get the piston retracted.

 

i had the same problem last week and i just kept messing around with it until it worked. i actually pushed on the pedal and the piston came all the way out. when iw as trying to put it back in i squeezed on the rubber around the piston causing brake fluid to shoot out then it went in fine but i had to bleed the fluid which is easy to do. so maybe open up the unscrew the bleeder bolt and let some fluid out?

 

my bad didnt read the last sentence lol

 

Hey sorry to bump a somewhat old thread, but this is exactly what I did to my rear caliper piston. There was fluid that squirted out of the boot. Does this mean that I blew the seals and need a rebuild? If anyone has any info on this, it would be much appreciated!!!