2002 Mustang GT rear disc brake Question
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Old July 21st, 2006, 01:10 PM   2 links from elsewhere to this Post. Click to view. #1
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2002 Mustang GT rear disc brake Question


I have a 2002 Mustang GT and I am attempting to change the rear disc brakes. I undid the caliper bolt and slid the caliper upright to attempt to change the pads but the piston is still compressed too tight to let me get the pads out. Now I read that there is a tool to reset the piston and I assume that I need to reset the piston before I attempt to remove the old pads. Please correct me if I'm wrong. What I need to know is where do I use this special piston resetting tool is it in front of me or behind the rotor? I am still used to using a clamp so this is different. Also what is the tool called so I know what to ask for?
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Old July 21st, 2006, 01:12 PM   #2
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It's like a little cube with notches on it, you put it on a ratchet and twist the caliper piston back in. You get it at auto parts stores, it's pretty cheap.
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Old July 22nd, 2006, 12:24 PM   #3
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I looked up the tool your talking about. One more question. Where is the notch to wind back the piston on the caliper. Im sure Ill see it when I take off the tire again but Id rather have an idea where to look.
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Old July 23rd, 2006, 11:47 AM   #4
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the notches you turn are on the caliper piston behind the brake pad, also make sure you don't have your e-brake engaged.
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Old July 24th, 2006, 03:24 PM   #5
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Thank you guys for your help. I got the tool and changed my brakes. Saving me a nice amount of cash. Without people like you helping the rest of us we would be forced to overpay for easy maintenance.
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Old July 24th, 2006, 03:27 PM   #6
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Ohh one more thing. It was kind of a pain in the ass, winding the piston back. But still worth it.
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Old July 24th, 2006, 04:21 PM   #7
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yeah i don't have the tool, but use a set of flat tipped pliers to do the same thing, but you have to be really careful when doing it as you found out there is a little resistence there so it is easy to mare the caliper piston surface.
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Old September 1st, 2010, 06:17 PM   #8
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Caliper tool


OTC/Disc brake piston tool (4589) | Brake Tool | AutoZone.com

Buy the tool displayed above. Though none of the surfaces will fit, a few modifications will help the problem.

On the surface with four small pins, cut two DIAGONAL pins with a hack saw, and file down if necessary. This will provide enough distance to smoothing grasp the slots of the piston.

The slots are located behind the rotor. You will have to take off the caliper, and the you will see the piston. Use this tool to compress it. Very easy.
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Old September 2nd, 2010, 11:29 PM   #9
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Also if you have abs you need to crack the bleeder screw before forcing the piston back. If you don't you run the Risk of ruining a abs unit which is probably around $2500
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