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914World.com _ 914World Garage _ M rear calipers

Posted by: smrz914 Aug 9 2005, 02:11 PM

So I'm wondering what the post is for inside the bores. It's making it hard to get the pistons back in. Inside the pistons is a circlip holding something in. That something seems to grab the post inside the caliper.

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Posted by: smrz914 Aug 9 2005, 02:13 PM

closer

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Posted by: smrz914 Aug 9 2005, 02:14 PM

the something

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Posted by: davep Aug 9 2005, 03:18 PM

That is a piston retraction mechanism. Along with the rubber seal, they pull the piston back to allow venting clearance between the pad and rotor. The rotor wobble pushes the pad back. That way the pads don't rub all the time resulting in unwanted friction.

Posted by: Krieger Aug 15 2010, 11:58 AM

Old post brought back. So I got two rear m-calipers from Parts Heaven. One had this set-up. The other does not have this set up, and is just your standard piston that looks like a cup. I need to send one back. So I can have two of the same. (I think) Which one. The one I have with the penis thingy is in not as good of shape.

Posted by: Krieger Aug 16 2010, 08:52 AM

for Mr Shea.

Posted by: charliew Aug 16 2010, 02:34 PM

Or you could buy new ss pistons without the retractor mech.