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Old 11-15-2010, 02:32 PM   #1 (permalink)
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Rebuilding Master Cylinder

I changed the brakes on my 2002 mxz 500 and i pulled the caliper off, compressed the pistons, threw the new pads on and now i have no pressure in my line. My guess is I need a master cylinder rebuild kit. Where can i get one. Any ideas
Thanks, Any help is appreciated
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Old 11-15-2010, 08:22 PM   #2 (permalink)
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Get a brake vacum and suck the brake fluid back threw to the caliber!
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Old 11-15-2010, 11:32 PM   #3 (permalink)
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Dennis Kirk may sell one. They have a website Denniskirk.com I think, or the doo dealer
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Old 11-16-2010, 06:19 AM   #4 (permalink)
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Have you bled the brake system until it pushes the fluid through?
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Old 11-16-2010, 07:04 AM   #5 (permalink)
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I have bled the system and I only got one piston on the caliper to come out... The other piston is still compressed I can not get it to come out
Any ideas
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Old 11-16-2010, 07:29 AM   #6 (permalink)
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Couple thoughts, is the piston returning in the master cylinder? if not, its not going to get its next sip of fluid. Is the brake lever returning to its normal position on its own? That is the first way to tell if its returning, if its not remove the line at the master and give it a little bump of compressed air.

As far as the caliper, I am a Polaris man, they only use one caliper piston, this sounds like a dual piston, one on each side of the Rotor? and only one piston is moving? something to try is, if you get the master cylinder free'd up and working, sounds like whan you pushed the caliper pistons in, when the one hit the bottom it got stuck in some goop in the bottom of the bore, push both pistons back, and put a C-clamp on the piston that is moving ok, then pump the brakes and see if you can get the stuck piston moving again, I would even squeeze it back in and pump it back out several times to free it up. you may even want to go so far as remove the caliper and the bleeder screw and flush it out as best you can with some brake clean and compressed air, then put it all back together and fill with fresh fluid.
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Old 11-16-2010, 08:18 PM   #7 (permalink)
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Brakes work! thanks to the information given on this forum i got them to work. What i found a little odd though, is when i started the snowmobile to test the brakes out, my engine was running at like 500rpms, it was so low the needle was bouncing off of 0. I adjusted the idle back to around 1500 rpms. Is it maybe because of the new pads that just need to be broken in? I just though it was a little odd.
Any ideas?
Thanks guys
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