[T3] Master Brake Cylinder...

[J. Jonik]

There may be some info on this deep in my VW folder....but....
Q.   Any way to determine best of old, out-of-car master brake cylinders to use to replace one that's obviously bad...leaky, etc.?   Awkward, messy job...don't want to just try one, then another, and so on.
   I may have 6 or more cylinders...all removed from cars ages ago when the cylinders worked just fine.  A couple cylinders are in thin plastic bags, one actually has silvery metal still on it....not just rusty and greasy.
PS:  Safe Driving Advice: A defunct master cylinder still stops the car...but nothing like it should. One is forced to keep safe distance from cars in front and to avoid any situation where a sudden stop might be needed.   This is BAD safe driving advice, but...working so far.
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