Clean up a master cylinder?

[owl10]

Hi,

I've got a pre-radial type master cylinder on my zx6r j1 (2000) which looks pretty rusty on the inside.

Currently no fluid in the cylinder.

I plan to refurb, and was wondering what is the best way to clean it up?

Simply fill the reservoir with brake fluid for a week? Kurust?

Any advice appreciated.

Cheers
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[Polarbear]

[MCN]

Krust only works on rust. (Iron Oxide).

If the cylinder is aluminium then it will be aluminium oxide.

It can normally only be removed by polishing. Elbow Grease. Unless you can find some chemical that will dissolve it. But the same chemical will possibly attack the good metal too.

If it is 'rusted' inside i.e. the piston bore, then a seal kit will only provide a temporary fix as that part must be very smooth for a perfect seal.

You can get one ebay for about £30.
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

[stinkwheel]

It'll most likely be crystalised brake fluid deposits rather than heavy alloy corrosion. The brake fluid tends to absorb any moisture in the system which makes corrosion less likely to occurr in a big way.

Strip it, wash it in the sink with hot soapy water and a non-stick pan type cleaning pad, rinse it in hot water (I pour the kettle over it) then dry and clean through with brake cleaner solvent.

Or put it through an ultrasonic cleaner if you have one.

The reservoir part is just that, a reservoir so some stable alloy corrosion in there isn't going to be a big issue (by stable, I mean firmly stuck to the metal, not coming loose). If there is a lot of corrosion/pitting on the bore where the piston sits, it might be better replacing it. If the bore is clean, fit a rebuild kit and crack on.
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