SOHC.co.uk Forums > CB350/400
Seized brake piston
PaulC:
--- Quote from: Bryanj on November 26, 2021, 08:42:08 PM ---Ive never had the grease gun fail, but then i do use the air one at work, also you can get a caliper complete with with mounting, bolts, adjuster and pads from amazon for about £66. Put cb 500 caliper into the amazon search but scroll down as there are several and prices vary a lot, if you leave out the bracket i saw one at £51
--- End quote ---
Bryan, if all else fails that'll be my final option
Cheers
PaulC:
--- Quote from: Oddjob on November 27, 2021, 04:20:01 AM ---This has never failed for me.
Get the caliper, turn it upside down, flat side down. Now get a 10mm drill and drill a bloody big hole in the dome section, get a 10mm bolt and just drive that bad boy piston right out of there. Now you say, that's left a big hole in my caliper but fear not intrepid adventurer the solution is at hand.
Get an old style sixpence and just braze that over the hole. In case it leaks then just braze a old style penny over that, if that leaks then I'm sorry but I can't help you, you're just crap at brazing.
This advice of course only works if you have a handy supply of old style currency, don't try this at home kids.
--- End quote ---
I had considered drilling and tapping the piston or trying to weld a bolt to it. Unfortunately I'm all out of old coins and my brazing is worse than my welding 😀
Moorey:
If you can't get it out with a good grease gun then I would think the oil ways in the caliper are solid and must be cleared first. A good
high pressure grease gun should be able to do 1000bar which is far far higher than the pressure generated in a braking system.
We used grease guns at the pit on hydraulic nuts and locked them off at just under 1000bar.
PaulC:
--- Quote from: Moorey on November 27, 2021, 12:07:01 PM ---
If you can't get it out with a good grease gun then I would think the oil ways in the caliper are solid and must be cleared first. A good
high pressure grease gun should be able to do 1000bar which is far far higher than the pressure generated in a braking system.
We used grease guns at the pit on hydraulic nuts and locked them off at just under 1000bar.
--- End quote ---
Moorey, that's exactly my thoughts, so I got the Dremel out with a fine bit and that sorted it. Thanks everyone for your advice and comments. The caliper is now sat in evaporust overnight and I'll check it's condition tomorrow. I also drilled a small hole in the piston so I could free it with a drift, which worked a treat.
PaulC:
This is the end result:
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