I can feel the car slightly pulsating forward and backward as I brake descending a hill. The steeper the hill the more noticeable it is. I can also see my passenger's head bobbing a little with the car. Lol. Hmm maybe I shouldn't laugh. Once I'm stopped at the bottom of the hill the motion is gone. Brake pedal not pulsing. On a level road coming to a quick stop I don't notice anything. Also can feel a bit of vibration in the steering wheel and front end when on the highway at 65 mph.
Still occurs after doing the following:
Tires rotated front to back and vice versa.
Driver's side tie rod replaced and car aligned.
I had a mechanic rotate the tires because when I tried to remove one, the lug bolt was not turning when applying force with the lug wrench and pipe extension. I didn't want to apply too much force because I thought I might break the bolt. The tires were probably over-torqued but that would be about a year ago and the problem is just now appearing. There's plenty of material on the discs and brake pads. The outer circumference of the disc is rough, but does not appear to be a contact area. Shocks seem to be ok when pushing on the front left or right fender. Not bouncy at all.
Does this appear to be brake related or suspension related?

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1985 300D Turbo
"Evolution is God's way of giving upgrades" Francis Collins