"Brake Pressure" warning - 91 750IL (archive)

I have been BMW owner for about a month now. And I am attempting to bring my 91 750IL back to the condition it should be in. I don't know enough about the many complex systems of the car yet. But I am learning. I have read almost every message posted here especially if it has to do with the brake system.

I have recently seen a message on the dash message system that is indcating "brake Pressure - See owners manual". This started about a week ago and I would like to get the groups feedback b4 I spend lots of money trying to fix the yet to be identified problem component(s).

Brake pedal pedal pressure/resistance fades as you increase effort and almost seems to go away completely near the floor. I can find no leak in the hydro system nor in the brake system. So my guess is the master cylinder is "bleeding pressure" past the "cups". Or it is the brake accumlator I should suspect (which is sealed? thus I would see no leak right?). Or the brake hydro booster?

I would love if someone could point me to a site that would explain the functions of the brake accumulator and the brake hydro booster.

I am thinking of replacing the brake accumulator and master Cylinder.

Is this a good plan?

Thanks for your help and advice
Sidney B. Nice

Follow Ups:

Re: "Brake Pressure" warning - 91 750IL Gilbert 15:53 10/15/2000 (0)
Re: "Brake Pressure" warning - 91 750IL sam 10:24 10/15/2000 (3)
- Re: "Brake Pressure" warning - 91 750IL Sidney B. Nice 10:48 10/15/2000 (2)
  - Re: "Brake Pressure" warning - 91 750IL Jim Derrig 11:18 10/15/2000 (1)
    - Re: "Brake Pressure" warning - 91 750IL Bryan Garner 22:36 10/15/2000 (0)

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