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New bike = new thing to tinker with.

  • Thread starter Thread starter AceFrehley03
  • Start date Start date
Stuck piston in caliper: Very common problem.
First get it off the bike.
Measure how much piston is sticking out.
Then put a 2x4 piece of wood over the piston (the "cup"). Whack the hell out of it with a heavy hammer. Measure again. If it's lower (less sticking out), then you've loosened it.
Even if it's not lower you still might have loosened it.
Now hook it up to the brake line, bleed, and pump it out using the brake lever. Air is much more compressible than liquid and will have a harder time budging that piston.
 
Hey Nabrams. Thanks for the great advice. I managed to rebuild/reseal all of the calipers without issue. Front brakes are great now. I'm having a hard time with the rear master cylinder behind the side cover, above the right footpeg.

On bikebandit.com the blow-up diagram shows a spring assembly as being inside of the master but I can't see that. It's stuck inside and I can't get it out. I got the rod (the one with the half-dome top) out of the cylinder fine but I can't get the rest out. It's rusted in there. I tried blowing it out with compressed air but didn't have any luck. I'm probably going to have to use water and try to hydraulic it out, and find a few solid bolts to fit the threads. Any other ideas, or is there a trick to getting this thing out? I've practically bathed it in WD-40, have worked on it as much as possible and still have no luck. Any ideas?
 
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