SOHC.co.uk Forums > CB500/550
UK 500 fixer upper
SumpMagnet:
Ahh...sticky brake pistons .... how much fun I had with mine!
In the end, I resorted to a blowtorch.
With the caliper off, but still connected up to a master cylinder, I applied heat around the piston and around the area where the seal was hiding. Once I got it hot....I pumped on the lever...and the thing moved. Soon as it cooled...it was rock solid again.... so I repeated the process until the piston finally released.
Ther ewas a bit of corrosion to clean up in the caliper around the bore.....but once I had got it fettled...all was good.
The piston is in the bin. I had corroded around where the seal had been sat for how ever many years...and would chew up any new seal.
mickandsej:
It’s the pad that’s jammed, not the piston :-( I couldn’t get the split pin out so I pushed a bit too hard to pass it. I fitted the caliper to the brake lines and bled it and even strapped the lever full on and left it but won’t budge. Working when I was too tired I made a mistake....
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Bryanj:
I bet grease will shift it
florence:
might be a silly question but you have split the caliper in half by taking out the two bolts?
mickandsej:
Yeah the caliper was torn right down. Put it in a box for now, more serious troubles!
Had a good day yesterday doing the wiring, decided to look at the snapped manifold studs. I was waiting to get the bike off the lift as the Dunstall pipes can’t come off whilst it’s on there (they fully wrap around the sump).
Sealey stud remover couldn’t get on the outside no4 stud but with a blow torch and lock nuts I got it off first go, so I did outside 3 stud which was snapped, same result, full of confidence I decided be sensible do all 8, first 6 were fine, inside 3 was tricky, inside 2 was really struggling. Ultimately after all the efforts that is the one that sheared just below the surface. Taking time out to think of the best solution - try and extract it or go straight to Helicoil?
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