Nigel Baker wrote:
Check the bore of the Cylinder carefully for corrosion. That will strip the seals fast if it has. As it is running normal car brake fluid there  is a likelihood of corrosion. If fine it can be honed. If deep it is  stuffed and fitting new seals will only delay the inevitable as the new 
ones will leak soon too.
Also check the slaves for the same problem. The normal aircraft hydraulic is better in that it doesn't retain  moisture like the car stuff. If you change it over by changing seal type don't forget to change the  hose as well (it is due every 5 years anyway !!).
Cheers.
Nige.

If changing to aviation hydraulic fluid (probably not a great idea in our case as all the others are automotive) you'd also have to change the  caliper seals.

Overcome hygroscopic problem by changing fluid every couple of years.

Cheers,

Russell.

I meant if changing all the seals don't forget the hoses as it is easily done. Yes bleeding the system each year to replace all the fluid thus flushing it  makes a big difference.

So when was the last time you guys actually did that as an item for an annual inspection ? cause that's how often you need to do it in your  environment and yes in a car too.

I rest my case.

I'll stick with aviation fluid I think and yes I bled mine a couple of years ago even though it is "real" oil.
Nige.
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Does the 5 years also apply to braided stainless lines with teflon inners?