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The rear brakes are collapsed by using a c-clamp or a caliper tool designed just for doing that. keep the pad on the side that the piston is on, then use a c-clamp or just pressure to collapse the piston. I've found that if working properly, most calipers can be pressed back into their seat by hand. The tool just makes it even easier. Be sure to loosen the Master cyl cap to allow air to escape & if it's too full, remove some fluid as when you collapse the piston, the fluid will return to there and overflow if there is too much.
If the piston appears to be stuck, inspect to be sure it is not cocked sideways a hair, they must be straight when going back in or they will wedge.
If it is sideways, carefully press on the brakes to cause it to move in the direction of applying the brakes again, it is best to put a block in between the remaining brake pad and the outer caliper to prevent the caliper from overextending, you only want to free it up. You can also try twisting a hair as you push in on them and try to seat them but usually on that type caliper it's straight back and done.
You can loosen the bleeder valve while returning the pistons to their seat & eliminate the old fluid from returning to the master cylinder but you have to be sure not to allow air to enter the system or you'll need to bleed the system later.
Did you notice the brake fluid level in the master cylinder before you tried to collapse the calipers? You should see a rise in level as you collapse them (however far they did collapse). If you're not seeing any change in the level (it should fill up) you might have a plugged valve between the caliper and the master cylinder. Loosen the brake fluid line to the caliper and try collapsing it again. If still no go, start dismantling the caliper and look for bent, broken, stuck or mal-adjusted pieces.
The rear caliper piston needs to be turned at the same time it is being compressed. Autozone rents or borrows the tool you will need for this repair. If the piston will not retract into the caliper, the caliper will need to be replaced. Craig
nice car i have one myself but the back brakes are a little bit tricky because you can not just push the brake calipers piston back into the bore. but here is how you can do it. you need a large plieres and you have to put the head of the pliers into the calipers piston then spread apart the handels so that the head of the pliers opens up against the inside walls of the piston. then all you have to do is Turn the piston back into its bore. See the rear caliper piston on the mustangs are just like a bolt. they are threaded into the bore and when your pads were they screw them selves out so when you redo your brakes you have to screw them back in just like a bolt. I hope this helps you out on this and if you have any more questions about this procedure just let me know and i would be more than happy to assist you in this.
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those calipers in the rear have slots on the piston right. that means you have to turn the pistons in clockwise. sometimes a pair of needle nose pliers put in the slots and turn will work, otherwise there is a rear caliper brake tool to turn those pistons in.
Use a C-Clamp, tighten down on the caliper and pistion at a moderate to slow speed. I had a similar problem with my 300ZX brakes not wanting to retract all the way, come to find out, the piston had come out far enough to let dirt in , and was locking up the pistion. I had to blow the piston out of the caliper, wash the pistion and caliper well, thouroughly with brake fluid, and the put the piston back in. If you are not comfy with the idea of doing that, you may have to replace that caliper.