cleaning caliper piston

[Random13]

what would you use to clean a rusty caliper piston ?

dremel with wire brush ? would that scratch it and hence dangerous ?

Thanking you

[mentalboy]

Pics??? (of the piston, not the dremel!)
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Make mine a Corona.

[Random13]

Proactively asking before taking them apart

[wr6133]

If it's really rusted I'd replace it. Though that can get expensive if lots are fucked.

[mentalboy]

[Fizzer Thou]

Is it rust or dirt?

A friend needed one new piston for one of his four piston calipers on his GSXR750 a few years ago.At the time they were really expensive as OEM parts,so I asked a machine shop to make one out of a decent grade of stainless steel.

Cost was about £5 at the time
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Just talk bikes.What else is there?

Always have a 'Plan B'

[Wonko The Sane]

as has been said, might consider a re-build / refurbishment kit of new seals and piston depending how bad it is

otherwise brass brush is softer than the piston so should be ok
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[Vincent]

You need a really smooth surface on the outside of the piston...any serious corrosion usually messes it up and makes it unusable......as does grinding the surface down with something abrasive.

I've reverted to buyung used calipers with decent pistons rather than pay the sometimes rip-off price for new ones.
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Space Is Deep

[Taught2BCauti...]

I use a stainless-steel scourer for most surface rust jobs, because it doesn't break-up like ordinary wire wool.

On a caliper piston though, if it has rusted below the line where it contacts the seal, I would bin it and get a new one - it's not worth the risk.
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[kerr]

[Random13]

cool , was just concerned if I can use a wire brush on it.

is it not like car piston which any scratch or uneven surface can mess it up ?
worst case scenario, big scratches on the outside of the piston, does it let fluid out ?

[mentalboy]