brake fluid

["James Shope" <healeymanjim@JoiMail.com>]

after destroying my complete brake and clutch system some 30 years ago by
using american brake fluid, i was told that the british used live rubber and
therefore you had to use ester based fluids, i.e., castrol or lockheed, etc. i
have been told that the brake and clutch parts are now made of neoprene or
some such synthetic and that american(petroleum based) fluids are ok.  i still
only use castrol but am i wasting my money or being smart?  healeymanjim