Does this happen only at higher speeds? With my 87 300D, the brakes are scary above 60MPH. There is a very strong pulsation and not much braking. I have been trying to cure a high speed brake pulsing for quite some time. I, too, have changed all of the rotors and pads several times and even used very high quality non-OEM rotors but it did not cure the problem.

Your question interests me because my car was originally owned by my late father in law who managed to have some earthquake-like collisions prior to my getting the car in 92. It could be that one of those did in fact damage something like a hub. No mechanics -dealer or indy-have been able to correct the problem.

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87 300D 265Kmi
Factory rebuilt crate 603.96x engine at 200K