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Old 12-27-2015, 07:00 PM   #1
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Rear Brake Caliper

Today I disassembled my rear brakes just to check that my slide pins were sliding easily. I've had a problem with that and was just doing some Sunday-afternoon PM.

However. The caliper piston on the passenger side had rotated 90 degrees. The two notches were horizontal rather than vertical in relation to the caliper. Is this a problem?

Something else. I could not turn the piston. Problem?

I changed the other rear caliper about two years. I don't suspect this caliper is dragging as I check my wheels for excessive heat occasionally. The brake pads had normal wear. So, i believe that caliper is functioning normally.

Any ideas? Thanks.
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Old 12-27-2015, 07:09 PM   #2
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Rear Brake Caliper

The Pistons screw in to compress and don't just compress like normal Pistons. They are designed this way. It's normal operation unless I'm missing something.


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Old 12-27-2015, 07:26 PM   #3
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Check. I was trying to turn the piston.
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Old 12-27-2015, 07:55 PM   #4
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You can get a caliper key that attaches to a 3/8 drive. That will turn it in no problem.


2003 GT: JLT CAI, summit 75mm TB, C&L plenum, 24# injectors, Mac Prochamber, SLP LM1 cat back, 3.73 Gears, FR500 Diff, FR500 diff cover, Jmod trans and shift kit, Max Motorsports subframes, Koni oranges front and rear, DBA discs front and rear, shrader performance rear seat delete, APSX D2 wideband, MPT happy customer.
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Old 12-27-2015, 08:04 PM   #5
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Rear Brake Caliper

Double post. But I attached mine to my electric impact and turned it that way. One side of mine was really stuck and it made short work of it.


2003 GT: JLT CAI, summit 75mm TB, C&L plenum, 24# injectors, Mac Prochamber, SLP LM1 cat back, 3.73 Gears, FR500 Diff, FR500 diff cover, Jmod trans and shift kit, Max Motorsports subframes, Koni oranges front and rear, DBA discs front and rear, shrader performance rear seat delete, APSX D2 wideband, MPT happy customer.
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Old 12-27-2015, 08:59 PM   #6
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There is a special kit you can rent from Autozone or just buy it for like $15 from Harbor freight that turns the pistons in via those notches. The universal cube thinger does not work on Mustang pistons.
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Old 12-27-2015, 10:58 PM   #7
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In the past, I have used a needle nosed vice grip to turn the piston each time I needed to. I had not checked Harbor Freight for that tool. I'll do that.

This brake seemed to be working correctly while taking a test drive. I heard the clicking sound when I backed up the first two times. So, I guess the auto-adjust functioned correctly. I had no idea how the piston turned itself or why I can't turn it now.


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Old 12-28-2015, 07:14 AM   #8
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If you come across one that is very stubborn or has been pushed all the way out just loosen the bleeder valve and compress. Remember to bleed brakes afterwards

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Old 12-28-2015, 11:25 AM   #9
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Quote:
Originally Posted by lowflyn View Post
If you come across one that is very stubborn or has been pushed all the way out just loosen the bleeder valve and compress. Remember to bleed brakes afterwards

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Nice tip, lowflyn.

I had unscrewed the master cylinder cap (and laid the cap on its opening).

Your tip will be better.

Thanks
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Old 01-01-2016, 08:13 AM   #10
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Because the parking brake is built into the rear caliper the piston has a compress and rotation motion to it. When I bought my mustang one of the first things I did was a brake job and noticed that the previous owner had them changed or replaced them himself and the pins on the pads were not properly lined up with the pistons and they destroyed them. I ended up getting rebuild calipers and the proper tool to lined them up and fixed it. It is a nice tool to have and with proper maintenance your brakes will work great.
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