Hi, if this is a front caliper that is still on the rotor, I pry between the rotor and rear brake pad to push the piston in. I usually have to pull on the caliper a bit to get it retracted enough to get a screwdriver in between. If the caliper is already off the rotor, I leave the old inside pad on the piston and put a large c-clamp over the caliper to push on the pad and retract the piston. If this is a rear disk caliper or if you have any questions, please reply.
SOURCE: rear electronic patking brake/ caliper looks SCARY.
Your A8 and new shape A6s with electric parking brakes require an electric input to the vehicle to tell it to wind back the pistons/pads. Main dealers have this on their diagnostic equipment. You can also purchase after market tools that just do this operation, heres an example
http://www.alpha-bid.com/product244.html
I have only ever used a main dealer machine so im not sure how good an after market one will be. Im not aware of anyway of doing the job without an electrical input to wind back the pads, the motors are very powerful so I wouldnt reccommend trying it manually. Hope this helps.
SOURCE: 2006 Mustang rear break caliper piston will not compress
Hi Alberts73,
The caliper piston has to be turned clockwise as it is compressed. If not,it will not retract. This will allow the park brake to reset. If you have only pressed the caliper in with a "C" clamp,you may have damaged the mechanism inside the caliper. If this has happened,you will need to replace them.The OTC #206-026 is the tool for turning the caliper back into the bore. I hope this helps,if you need more information,drop me a line. Thanks,Chuck
SOURCE: 2006 Kia Spectra 5 rear brake disc replacement
One side,turns right,and push in slightly,and the other side turns left,to retract.
SOURCE: 2006 Kia Spectra 5 rear brake disc replacement
you need a special tool avalable at most parts stores. its a disc brake piston turning tool. you have to rotate piston clockwise while pushing in on piston. you can fabricate something that enguages the slots and push and turn till all the way in.make sure to note position of slots and put them in same place as was before or the pin on the pads wont enguage the slot
SOURCE: how to compress rear brake caliper piston
Only way is to use diagnistic equipment.Go to HAND BRAKE . There is option to release the pistons.When you change the brake pads you have to use option - engage .
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