Vehicle does not pull to either side, and the vibration seems to come from the passenger side.

I will not drive 70mph when I have problems braking. 45-50 mph is even too fast.

Vibration is slight at lower speeds, and seems to be more pronounced during harder braking at higher speeds.

There is not any vibration without braking, at any speeds.

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1989 560SEL (172k)
1989 325IC (122K)
2004 Suzuki Volusia LE (3500 miles)
2005 Yamaha Road Star (20 K miles)