Rear caliper piston won't compress - Mazda3 Forums : The #1 Mazda 3 Forum
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post #1 of 11 (permalink) Old 01-14-2011, 01:50 PM Thread Starter
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Rear caliper piston won't compress

I'm replacing my rear pads and rotors on my 06 hatch. I was able to remove the calipers and everything, but I'm having problems with the piston. I'm using needle-nose pliers to turn the piston clockwise. It's turning but it's not compressing. What could be the problem?

EDIT: oh and the parking brake is not engaged.
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post #2 of 11 (permalink) Old 01-14-2011, 02:42 PM
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Re: Rear caliper piston won't compress

I *think* you have to turn and push. I've done the rear brakes on my car about a dozen times due to some defective parts. I bought a brake tool kit from Northern--much better than needle nose pliers.

Here's something similar for $45: http://www.amazon.com/Astro-Pneumati...142&sr=8-1

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post #3 of 11 (permalink) Old 01-14-2011, 02:45 PM
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Re: Rear caliper piston won't compress

Have you tried twisting and pushing at the same time?

edit: I've been ninja'd.
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post #4 of 11 (permalink) Old 01-14-2011, 02:46 PM
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Re: Rear caliper piston won't compress

[quote author=dugger_8 link=topic=184849.msg3907685#msg3907685 date=1295034323]
Have you tried twisting and pushing at the same time?
[/quote]

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post #5 of 11 (permalink) Old 01-14-2011, 05:17 PM Thread Starter
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Re: Rear caliper piston won't compress

Yeah I tried twisting and pushing and it still won't compress. I'm probably not pushing hard enough. I'm just gonna rent the brake caliper tool from autozone. Maybe that'll help.
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post #6 of 11 (permalink) Old 01-14-2011, 05:36 PM
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Re: Rear caliper piston won't compress

[quote author=sittinginahatch link=topic=184849.msg3907944#msg3907944 date=1295043422]
Yeah I tried twisting and pushing and it still won't compress. I'm probably not pushing hard enough. I'm just gonna rent the brake caliper tool from autozone. Maybe that'll help.
[/quote]

You could try taking the cap off of the master cylinder and see if that's the problem. However, the tool is probably going to make everything easier anyway.

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post #7 of 11 (permalink) Old 01-14-2011, 07:05 PM
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Re: Rear caliper piston won't compress

The tool is much easier. I used that first on my 3 and figured I'd save time renting and used pliers on our 6, it sucked balls.
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post #8 of 11 (permalink) Old 01-15-2011, 07:09 PM
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Re: Rear caliper piston won't compress

I had same problem. I backed it out a little (as if it was to squeeze the pads) to make sure it was free and working then compressed it again after that pushing hard and twisting and it worked for me. I did it with needle nose pliers too.

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post #9 of 11 (permalink) Old 01-16-2011, 12:11 PM
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Re: Rear caliper piston won't compress

Yes, definitely use the brake caliper tool. I picked one up from harbor freight (luckily when I lived a mile from one) for $18. The tool itself fit the Mazda piston perfectly, but it also came with adapters for a bunch of other makes.

While it works the needle nose method is a huge PITA due to how hard you need to push in on the piston to make it retract. I had to use pliers on one of my calipers as it had worn all the way through the pad on one side and the piston was out so far that the tool wouldn't fit in until the piston had been compressed a little bit. It was a case of my parts came in but I had to chance to replace them until way after I should have.
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post #10 of 11 (permalink) Old 01-23-2011, 03:18 PM
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Re: Rear caliper piston won't compress

The needle nose pliers method works best AFTER you've given the piston a couple of sharp raps with a mid-sized hammer.
Both times I replaced rear pads(2 different cars) I worked myself into a lather before doing it. Then I gave it a good smack and used a large set of NNpliers and it twisted in ,nice and smooth.
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