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UK 500 fixer upper

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Bryanj:
Make sure the seal groove in caliper is surgicaly clean especialy in the corners. Dental picks or similar are best

mickandsej:
Having slept on it, the main reason to strip the caliper was a dragging brake - on inspection this was clearly caused by the pad not the piston, the pad was rusted around the edge and possibly even a few thou too big. The piston was pristine, the cylinder also. It wasn’t leaking before so I think I’ll be best just reassembling rather than risk a bodged seal...


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Bryanj:
This is an old system, you would not believe the amount of crud that gets into the seal groove making it too tight on the piston, it is only the twist in the seal as you apply the brake that retracts the piston so everything needs to be done.
Ive done 3 in the last month, all had solid brake fluid crud in the seal corners

hairygit:
I agree with Bryan, replace the seal, in the great scheme of things they are cheap. What price do you put on your life? With a new seal and a thorough clean of the groove it sits in, clean the meatal edge around the circumference of the pad, (,even if you're fitting new pads!) smear the metal edge of the pad with a little bit of copper grease and don't forget to clean and grease the pivot, then you will have a safe reliable brake again.

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Johnwebley:

--- Quote from: Bryanj on June 30, 2020, 07:11:23 AM ---Make sure the seal groove in caliper is surgicaly clean especialy in the corners. Dental picks or similar are best

--- End quote ---
You can use an old broken ring to clean the groove

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