Hydraulic fluid question

[Bruce Parker (RIP)]

Thanks for your comments. The systems I'm working on are identical to brake hydraulics. My clutch is new, so silicone would be fine, but the accellerator (which shares the same reservoir) is of doubtful age and may be subject to the failures you mention. My brake system has new master and wheel cyinders, but the hydraulic/vacuum booster sat for 10 years with regular fluid. Oh what to do????