SOHC.co.uk Forums > CB500/550
Re: Brake caliper re-assembly electrolysis worries
florence:
well, I have assembled the brake caliper, very easy and quick but suddenly realise I may have made a mistake. The new piston is stainless steel rather than the original chrome steel type and therefore will be prone to electrolysis with the aluminium and the bike spends most of it's time outside. Although the old type of piston goes rusty after a few years, it doesn't affect the caliper. Has anyone had problems with this and should I order an original piston?
Spitfire:
Put a stainless piston in my front brake in 2007, it's still fine, the piston is separated from the alloy by the seal.
Cheers
Dennis
Bryanj:
Fitted loads and never yet had a problem
K2-K6:
It needs to be assembled with silicone grease as this prevents an electrolyte forming from water and salt in the gap between the piston and caliper bore. There is no weather sealing on this type of caliper and this takes it's place as best as can be provided.
It's even in the first 750 KO manual as direct instruction.
Don't assemble with brake fluid as lubrication for the seal, it's hygroscopic (absorbs water) and just promotes accumulation of moisture to facilitate electrolysis.
florence:
OK, thanks for the advice, looks like I will have to take it apart again before winter and get myself some silicon grease.
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