SOHC.co.uk Forums > CB350/400

Front brake locked on

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Tomb:
As a Mech Fitter we're told never to use copaslip on ali coz of corrosion, on casing screws we get away with it coz the screw head tightened into the casing stops moisture getting in, but on the caliper pivot it can and in ali is 'sposed to react causing electrolitical corrosion.

I used normal grease and renewed the O'rings on the pivot.

I 'spose the O'rings should stop the moisture getting in ::) :D

K2-K6:
I've used for years a marine type grease that's used in outboard motor mount pivots and launch trailer wheel bearings amongst other things, seems to resist seizing quite succesfully and there is no real heat requirement there. Just seemed to match the application when I originally bought it.

I'll look at what I've used and post it (can't remember the name offhand).

Never owned a boat though!

Tomb:
Yep I have a tub of waterproof grease, normally use it on my trailer wheel bearings coz it lives outside and doesn't have body work like a car to stop the rain getting in.

I use this Clicky

meerkat:

--- Quote from: meerkat on September 26, 2011, 08:36:41 AM ---After 6 weeks of not using the 400/4 I went to move the bike and couldn't because the front brake is locked onto the disc.
The bike ran well the last time I used it and initially it could be moved around in the garage without a problem.
Before I start spannering today what do I need to look out for ?
All advice gratefully received.
Thanks in advance.

--- End quote ---
Finally after deliberating whether to strip the front brake system down or not, I bit the bullet today.
Penetrating oil on the pivot had made things slightly easier but the brake soon jammed on solid again.
The caliper piston was seized in the caliper and took ages to remove.
Result - ancient brake fluid, loads of rubbish in the caliper together with a seriously rusted piston.
Now to source a rebuild kit and fresh brake fliud.
Thanks for all the helpful replies so far.

SteveD CB500K0:
That's a brilliant example of what happens to these brake pistons...

Ouch!

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