Question about Harley Davidson Motorcycles
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Posted on Jan 02, 2017
To remove piston safely use the brake pedal to press out piston. You will need to remove the pads so it can do this. You will need a container to catch the fluid when the piston comes out. Clean the the piston with a fine polishing cloth 600 grit or higher so as not to leave scratches, replace piston if it pitted or burred. Clean inside of caliper, remove inside seal with dental type tool. Roll in the new seal, position same as old one. install new outter dust boot if equipped with one. Lubricate seal and leading edge of piston with brake fluid. Slide piston into calipier. You will need to make sure it is started straight and then use a C-clamp to compress the piston all the way in. Never ever use any oils or grease any any internal brake parts because it will cause seal failure. Clean parts are critical, but again , no petroleum products. Good luck
Posted on Jun 10, 2009
If by "disassembling the calipers" you mean splitting them open, DO NOT do that.
You detach the caliper so that you can remove the pads and get at the piston, but then what you should do is to simply pop the piston out.
That can be done simply by pumping the brake pedal, using air pressure (with a rag to prevent the piston from flying around), or with a grease gun.
Then once the piston is out, you simply wire brush any corrosion off. If the piston is so pitted that it can not be made smooth and will leak, then it should be replaced.
If you wash them out with anything other than brake fluid, then be sure to blow out any residue with compressed air.
Use lots of brake assembly lube, and ensure the new dust seal is water tight. Bleeding the brakes will flush out any remaining dust.
Posted on Oct 04, 2010
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