Storing used master cylinders

I have 3 Commando master cylinders in good nick, what is the best way to store them so they don't go grotty and gungy?

The short answer is to completely strip the m/c (s). Keep the parts for each judiciously separate, soak or spray them with a preservative that is compatible with the rubbers and bores, vacuum pack them if you have the means or double bag them if you don't.

Best.

I have my spare in a bag fully assembled with a few drops of DOT4 on the seals.

kommando said:

I have my spare in a bag fully assembled with a few drops of DOT4 on the seals.

Click to expand...

In my post I should have made a reference to the amount of time the storage is expected to last. I'm not sure at what point in time a complete strip vs. running in fresh fluid is appropriate; I am confident that new masters would be happy with a few drops of fluid and bagging, but a master that has seen service, was exposed to a few (many) cycles of condensation would be best served by being stripped, examined, preserved (with an appropriate chemical agent) and then bagged. At some point any trapped water will cause damage. Consistency of the temperature during storage is also a consideration; double bagging mitigates these effects especially if the humidity is low during the initial bagging.

Best.

You are going to need to strip down and make sure there is no moisture or condensation before sealing up tight in plastic. I'd never re-use old brake seals , only new on reassembly.

I bought a brand new complete M/Cylinder from one of our 'Big Three' here in the UK, with a view to fitting: 'sometime in the future'
Two years later, after heated indoor storage in the dealer supplied packaging, the seals were U/S...

EstuaryBoy said:

I bought a brand new complete M/Cylinder from one of our 'Big Three' here in the UK, with a view to fitting: 'sometime in the future'
Two years later, after heated indoor storage in the dealer supplied packaging, the seals were U/S...

Click to expand...

Would that be "utter shite"?

Which is probably what my original MC and lump are now...

I did the same with starter motor, bought one then stored it throughout it's guarantee period... Though in fairness the long dormant solenoid b*ggered the new motor by sticking on, and the motor's supplier didn't charge for repair....
U/S : Unserviceable, but I expect you knew that...