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SOHC.co.uk Forums => CB500/550 => Topic started by: JustcallmeMrT on September 13, 2014, 03:59:39 PM

Title: Corrosion on brake cylinders
Post by: JustcallmeMrT on September 13, 2014, 03:59:39 PM: I need an opinion - there is some pitting on the cylinders for my fron calipers, would you guys replace these?

(http://tapatalk.imageshack.com/v2/14/09/13/e6d9ca5828709d6165ef11976560ea73.jpg)(http://tapatalk.imageshack.com/v2/14/09/13/724680fc175591bbc1f931447e05dae0.jpg)
Title: Re: Corrosion on brake cylinders
Post by: AshimotoK0 on September 13, 2014, 04:03:29 PM: Well I would. I think you can get polished stainless ones now fairly cheaply.

Cheers .. Ash
Title: Re: Corrosion on brake cylinders
Post by: SteveD CB500K0 on September 13, 2014, 04:24:57 PM: Me too. Nothing worse than all that effort refilling and bleeding the system only to have to do it all again.
Title: Re: Corrosion on brake cylinders
Post by: JustcallmeMrT on September 13, 2014, 05:08:22 PM: I know I can get them from DSS
Title: Re: Corrosion on brake cylinders
Post by: Bryanj on September 13, 2014, 06:45:51 PM: Put it this way mate Â£50 for 2 pistons or Â£3,000 for the funeral costs after the brake failure
Title: Re: Corrosion on brake cylinders
Post by: Trigger on September 13, 2014, 06:57:14 PM: A good match is stainless steel pistons and genuine seals. Did find some stainless pistons for Â£12 each.
Title: Re: Corrosion on brake cylinders
Post by: matthewmosse on September 13, 2014, 07:53:27 PM: Having pulled em out I'd be putting new pistons and seals in, but so far I haven't had to replace a set on any of my bikes bar the 250 nighthawk, and I got a bike shop to sort that, wasn't much more than I could but the parts for ( actually a bit less he gets parts at trade prices) I have got away with worse pistons, but it really would be a false econonomy not to do new seals (safety wise I would never re use) and risk the new seals on those pistons.
Title: Re: Corrosion on brake cylinders
Post by: JustcallmeMrT on September 13, 2014, 07:55:02 PM: Quote from: trigger6969 on September 13, 2014, 06:57:14 PM
A good match is stainless steel pistons and genuine seals. Did find some stainless pistons for Â£12 each.
Where can I get those Trigger?
Title: Re: Corrosion on brake cylinders
Post by: Trigger on September 14, 2014, 02:58:05 PM: Are your's 38mm x 35mm ???
Title: Re: Corrosion on brake cylinders
Post by: JustcallmeMrT on September 14, 2014, 03:52:31 PM: Quote from: trigger6969 on September 14, 2014, 02:58:05 PM
Are your's 38mm x 35mm ???
Will have a quick measure next time I'm in the garage and get back to you.
Title: Re: Corrosion on brake cylinders
Post by: SteveD CB500K0 on September 14, 2014, 05:17:31 PM: 500/4 was 38mm
Title: Re: Corrosion on brake cylinders
Post by: Bryanj on September 14, 2014, 06:05:05 PM: 38mm diameter by 35mm tall, by the way 1 1/2 inch is 38mm
Title: Corrosion on brake cylinders
Post by: Doc. on September 14, 2014, 08:04:06 PM: I'd replace them, as you have them apart.
There's no way that sort of minor defect would cause Brake failure, but they will only get worse over time.

I've just made some new Aluminium ones for my VFR400R . . .
(http://img.photobucket.com/albums/v93/docv400/CaliperPistons_zps07ff627a.jpg)
I'd take one along to a machine shop and ask how much to replicate them in Stainless, it may not be too much at all, as it's a very simple job on a Lathe.
Title: Re: Corrosion on brake cylinders
Post by: Trigger on September 14, 2014, 09:08:18 PM: PM sent ;)