I ran into a problem on my 03 gti w/ having to spin piston in caliper, not pushing in.
I was wondering if my girlfriends 01 cabrio are the same set up with rotating rear pistons. please help
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There is a small tool to turn the caliper pistons
in or retract (that is actually the barking brake)
You also have to push the piston in, after you screw
in the piston,for that you open the bleeder & make sure
you have something across the caliper ,so your not pushing
on the piston with any clamp or other tool
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.
Dual pistons can be a bit tricky. If you just press one piston at a time, the other piston will push out further. Both pistons have to be pressed at the same time. I good way of doing that is to use one of the old brake pads pressed against both pistons, then use a large pair of channel locks or a C-clamp to squeeze the brake pad, pushing both pistons at the same time.
There is a special tool required for this job. It expands a plate between the piston and caliper but also has a threaded rod through the middle that allows you to turn the piston clockwise as it gets pushed in.
The rear brake caliper piston doesnt push back, it takes a specail $7 tool from Auto Zone or other part store, the caliper piston screws back into the caliper. pushing it back may damage the caliper, be careful here.
most falcon rear disc calipers require a special tool that fits into the piston then a 1/2 inch drive ratchet used to spin the piston while pushing in . You should be able to uy this from most auto parts outlets.
You're working on the rear caliper, correct? Those don't compress - they screw in, and you need a specific tool for that. AutoZone rents them on their tool loan program. To use it, find the piston socket that best fits the caliper piston, and use that. Open the reservoir cap and screw the piston back in, reseal the reservoir, install your new pads, and you're good to go (be sure to bed the pads in).
If you're working on the front and can't compress it, loosen the reservoir cap to relieve the seal of the system and allow the fluid to move without fighting against pressure. Replace the cap after the pistons are retracted.
If the problem is with the front caliper replace it. If the problem is with the rear caliper you need a tool that will compress the piston back into the caliper by turning it. Most auto parts stores will have a caliper tool for this.