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I'm having a problem where the front brakes don't seem to want to decompress.
It also seems to occur after sitting awhile or overnight. After this occurred yesterday I tried to clean up the pistons in the calipers. I removed the pads and pumped the brake lever to expand the pistons out of the calipers just a little bit and used some emery cloth along the outside of the pistons. I didn't want to remove the piston entirely because my local Kaw dealer didn't stock the seals/dust covers. I did this to both calipers. It seemed to work for a while. I took the bike out for a test ride and later last night for a short ride, and all seemed fine. Once again today after a short ride the I can barely squeeze the brake lever. I was thinking of ordering seals and dust covers and rebuilding the calipers but was wondering if maybe the master is the problem. I replaced the master cylinder with a used one recently. The brakes have been bled several times with a MightVac so I am pretty sure I filled with clean fresh DOT4 brake fluid. Any ideas?
 

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my first reaction would be none of the above-

you have a classic case of constricted lines-- replace your soft brake lines with new ones and I bet the problem goes away.

especially after sitting for a while, this can be a problem--
 

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Your problem sounds like the plunger on the master cylinder. I know this sounds like a big deal, but it isn't. The next time this happens take the brake lever off and try to pull the plunger out with a pair of plyers. You can buy a new plunger or possibly a rebuild kit. I had to do the same with mine.
 
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