symptom of a bad master cylinder ?(long) (archive)

How does a bad master cylinder feels like ?
I don't think a bad bomb is the cause for this....I have had a bad bomb before and it was completely the opposite : when light brake pressure is applied the car was ok , but when i needed to brake all of a sudden , it was like the brakes hit a slippery brick , ( I crashed by the way )....However the case now is that sudden brake pressure is OK , light brake pressure is OK , but in that last fraction of a second before the car stops all-way there is this considerable non-linearity in brake pressure and i have to apply more force to regain the same feel/pressure and bring the car to that full stop , at the same time the rear end squats lower to the ground and i feel like it's the rear brakes that just kicked in ! what's going on here !!!! I don't think it's a serious problem but it's annoying me greatly.
like i said before , i already got a brake bomb and i am planning on changine the whole brake system if i had to ! unless somebody comes up with the right diagnosis and lets me save a lot of cash !!!

Best regards Always
Adel Boksmati
1986 735i A
1986 728i A
newly sold my newly acquired 733i A 1983

Follow Ups:

Symptoms of a bad master cylinder Ben Charvet 86 735i CenFl 07:13 7/22/2001 (1)
- Thanx ppl. Gonna wait for the bomb & go from there Adel Boksmati 19:44 7/22/2001 (0)

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