2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

my brakes are tight

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Old Apr 12, 2007 | 09:47 AM
  #1  
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my brakes are tight

my question is how hard should it be to push in your calaper pistons on a 4 piston calaper and is there a easy way to do it.
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Old Apr 12, 2007 | 02:45 PM
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If you mean how hard is it by hand, you won't be able to do it. Take an old brake pad and place it over one side of the pistons. Then place one end of a C-clamp over the pad and the other over the back of the caliper. Tighten. The only thing to watch for is the pistons sinking in ****-eyed. Push until they are close to being flush or until you can get your new pads in and over the rotor.

Another method is to buy new calipers.

Brian
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Old Apr 12, 2007 | 02:58 PM
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Your brakes are hella tight, holmes.
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Old Apr 12, 2007 | 03:12 PM
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Originally Posted by RX7Tuner.
If you mean how hard is it by hand, you won't be able to do it. Take an old brake pad and place it over one side of the pistons. Then place one end of a C-clamp over the pad and the other over the back of the caliper. Tighten. The only thing to watch for is the pistons sinking in ****-eyed. Push until they are close to being flush or until you can get your new pads in and over the rotor.

Another method is to buy new calipers.

Brian
Assuming your brake lines are still hooked up, when using this technique be sure to remove the MC reservoir cap and cover with a rag or something- the fluid you are displacing has to go somewhere.
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Old Apr 12, 2007 | 04:05 PM
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I think I remeber reading somewhere that on the 4 piston set up you have to have a little twist action when pushing it in, not 100% sure though.
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Old Apr 12, 2007 | 06:23 PM
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Originally Posted by clokker
Assuming your brake lines are still hooked up, when using this technique be sure to remove the MC reservoir cap and cover with a rag or something- the fluid you are displacing has to go somewhere.
The MC cap has a vent doesn't it?

Brian
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Old Apr 12, 2007 | 07:09 PM
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I have a 90 model t2 and when i replaced my rear pads i had to twist the piston back, clockwise. Thats how the service manual said to do it.
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Old Apr 12, 2007 | 07:12 PM
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okay, for the front brakes, use a BIG channel lock + old brake pad and clamp, if everything is ok, it should go in easy.

for the rear, you need the tool, turn and push, with the cheap brake square tool thing.
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Old Apr 13, 2007 | 04:24 AM
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thanks guys u really helped
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Old Apr 13, 2007 | 06:36 AM
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Originally Posted by RX7Tuner.
The MC cap has a vent doesn't it?

Brian
Yes it does, but it's sized to accommodate the normal fluid/air displacement during operation- which is very little.
Pushing the pistons all the way in is gonna move a lot more fluid.
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Old Jun 13, 2009 | 09:37 AM
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HSGDMF I wish I would've known this last night at 11PM when I was working in the dark, pounding on it like hell to get it to retract. Ah well, either way this is good info!

Originally Posted by re-rx7
I have a 90 model t2 and when i replaced my rear pads i had to twist the piston back, clockwise. Thats how the service manual said to do it.
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