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Post by noakira on Jun 6, 2012 20:32:33 GMT 1
Good news on pulling your piston. Different approach but end result is the same, piston out !
However not good news from the perspective of trying to create a universal do-it-all caliper piston extractor tool.
However it has got me thinking about using a split washer / metal disc as the collar. Raised off the bottom of the piston by 5-10mm by a cheap plastic tube (id=16mm). Would the washer then get enough grip to pull the piston out or would the anchor just keep slipping out, hmmm.... Of to the garage....
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groovylee
Sheene Gold rider. Nuff said
Member of the QA team
Posts: 648
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Post by groovylee on Jun 6, 2012 20:46:47 GMT 1
noakira, if you send me the details of what you need machining up, i might be able to get one of my previous engineers to knock some out at my old work. prob wont be quick mind, but worth a go if only for a couple??
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Post by noakira on Jun 6, 2012 21:00:58 GMT 1
Cheers for the offer, trouble is this project is at the "barely-a-twinkle" foetal (R&D) stage. Ideally I need someone local to me with a lathe and some spare time (retired) and is prepared to tinker with it. It needs that one-on-one type communication really. Beside I still need to buy some vernier calipers and draw up some draft idea using draftsight. A mate of mine gave me a number for a retired engineer local to him in Essex, Phoned the number for a week no answer turns out the guy passed away around the same time he gave me the number - doh !
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Post by McF on Jun 7, 2012 8:29:55 GMT 1
Just catching up with this thread I would normally say that putting pressure back into the caliper should be enough to push the piston out If the pistons were this stuck, they and the seals certainly need replacing and do have a careful look at the bore for any signs of damage A trick I learned a long time ago was to "polish" the bore Use a small shaft eg from a long 10mm bolt (remove the hex head) cut a slot in the end and put in an electric drill use a strip of emery cloth threaded through the slot (think about rotation direction of drill and which way the abrasive side of the emery cloth faces switch the drill on and provided you keep the shaft central, the emery cloth works its charm through centrifugal force (or for purists - centripetal acceleration ) As ever do make sure you don't get brake fluid on paintwork; your hands or anything shiney use proper brake parts cleaner after work and before reassembly Your brakes will one day save your life. If in any doubt about the quality or serviceability of components - replace them
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Post by ilegalalien on Jun 7, 2012 10:11:23 GMT 1
Nice idea with the bolt... am off to make one.. i had ideas of using the dremel but that is a bit heavy for a skimming job... there's something satisfying about making a tool when it does a good job.. reminds me of my bent hex bolt used to take out the top nut on my stanchions many years ago...
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Post by ilegalalien on Jun 7, 2012 10:20:40 GMT 1
Thinking about it, maybe we need a new thread/subject for "Home made tools" where we can post all the useful home made tools that we have made to improve, alter or get a job well done..
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