The New And Improved Unofficial R65 Forum V2
Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: Julio A. on June 07, 2012, 08:02:46 AM
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Hey guys, My R65 is quite dead in the water for some time now due to a heavily corroded master cylinder. So Far, I may be able to find new seals for my piston. But If I leave my MC as it is, I'd guess it will leak again very soon. My Brake light stays on all the time since the front brake piston does not come back fully due to the corrosion. So if ever I do get to miraculously stop when I need to, chances are I'll get rear ended anyway.
I've heard of and got advice that re-sleeving the master cylinder might be a good option. Has anyone done it before? I have two spare MC pistons in my spare parts bin, a 13mm and a 16mm one. If ever re-sleeving is a viable option I'm keen on converting it to 13mm since I only use a single disk.
What do you guys think?
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Hi Julio - I replaced my badly corroded MC 15 years ago with a stainless steel sleeved unit. I'm in the middle of a total rebuild (again) and having removed the MC this time its a little stained of course but there is no corrosion in the MC that I can see. I have been using Silicon brake fluid since the last rebuild 15 years ago and I believ that helped too. Hope this helps ......
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I finally found a machine shop with tools small enough to do the job for me. Will bring the master cylinder there hopefully in the weekend for re-sleeving.
In a related issue, I'm trying to replace the rubber cup on my MC Piston, I'm finding it impossible to fit it back without ripping it up. Am I missing something here?
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Hi I think you'll find that - hjaving removed the piston from a "damaged" cylinder you should replace the whole assembly. You would have to buy the piston/rubber/spring etc as a kit (handlebar mastercylinder repair kit). Motorworks has them (www.motorworks.co.uk). You will need to know your piston size - that should be marked on the bottom of piston housing. The kits cost about 23 english pounds once the english sales tax is removed.
If the housing is going to be sleeved make sure you have it sleeved to the correct diameter. Good luck ...........