[Richard Hudgins]

Rob,

I would suspect the calipers and their mounting on your car.

If they are the BMW E-36 units they are floating calipers.

These can bind on the stud mounts etc. due to wear or even a loose stud mount.

In other words the mount geometry can get wrong and cause problems

The mounting is where I would first look.


Pressure differential in a closed hydraulic system is only true until the system stabilizes, then pressures are equal. (This time is measured in milliseconds)

Therefore you must look to mechanical problems such binding, alignment, etc.

Your corner weights would have to be way out to cause this problem.

And fluid is not the problem either.

You will get there, just look at the mechanical basics carefully and the answer will be there.