5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
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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