Brake fluids and rubber parts

[Larry Hoy <larryhoy@cwix.com>]

Ken Payne said (in part)

> I used AP550 for a while ... and [it] seemed to be harder on some seals.

So can anyone tell me about rubber seals?

What's the deal with certain brake fluids destroying certain fluids?

Is this problem a thing of the past?  Some how I gotta think that today's
brake rubber parts must be compatable with DOT 3, 4, and 5 brake fluids?
Can anyone enlighten me?

Larry Hoy