Hi, Old fluid would mean you having to pump the pedal to get pressure rather than the pedal going hard, so that leaves the master cylinder, the other reason for the pedal to go rock hard is air in the system, which is not your problem as you have'nt changed any of the braking components on the fluid side of the system.
You can of course go with a fluid change first thats up to you, but being an E39 with service its been changed many times before, ive run/had cars with fluid in and working fine over 20 years old.
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Last edited by marti5; 03-09-2009 at 02:04 PM.