Hi everyone, I am new to this forum and somewhat new to audi. I generally do all my own work on my car and have done some simple modifications to my car. Right now I am changing out my pads and rotors and have run into an issue that is driving me crazy. I did both the front pads and rotors and it went smoothly, now I am on the rear. I can not compress the piston in the caliper for the life of me. You turn the piston clockwise, simple as that right? I turn it and turn it and it rotates like it wants to work but it doesn't compress even a mm. I've tried pressing on it with a c clamp as well, somewhat lightly. I also noticed that on both sides in the rear the pads are barely warn at all. Are my rear brakes doing anything? Are my calipers broken? Why won't the piston compress? Any help would be greatly appreciated, thank you.

 

they turn as they go in. Spiral I guess is a better way to put it. They don't just push straight in.

 

yeah, thats what i thought. i try and rotate the piston like a big bolt and it rotates but doesn't move horizontally. even while pressing on the back of the rachet it doesn't move. its very wierd to me. any ideas?

 

could be seized. make sure you have your brake fluid reservoir open, less pressure.

 

what kind of tool are you using to compress/rotate the piston in? i ran into this problem a while back. I only had a hand tool to rotate the piston, and bent that pretty early on. needless to say i got fed up, and took the car to the only place that was still open (monroe)
dude used an impact driver that had the attachment to compress/rotate the piston in. took him a bit, but i know id have never turned that sucker in by hand. i know in my case the parking brake worked fine, the pistons would extend and retract correctly, so i really didnt want to get a new caliper without either getting them to turn or breaking them trying.

 

I used a universal square tool made for turning caliper pistons and the tool did its job just fine, the piston just wouldnt retract. I did the other side today and it was much stiffer and acted like it was supposed to. I think that caliper must be broken somehow but still holds fluid, thats the only conclusion I can come up with, guess I'll be using three disks for a little while

 

^ dont do that, you'll ruin your new breaks. Get a new calliper, it will save you the headache of doing this again in the near future.

 

alright, i suppose it has to be done anyway so why not sooner than later to prevent further damage. thanks for the input

 

Are you using the special brake tool required to do the rear brakes on the tt?

http://www.ttstuff.com/mm5/merchant....gory_Code=T2PB

Otherwise, it does sound like your caliper is junk.

 

Also- make sure you get the correct brake fluid when you blead them. IIRC, it was difficult to find.