My wife purchased a 2006 C280.

we put new tires on it and had it aligned. About 700 miles later the brakes started to "Pulse" in the pedal and the steering wheel.

I purchased a front rotors and pad set from FCP Groton. The car was smooth as silk.

Around 600 miles later the pulse started again. I tried "bedding" the pads but to no avail. I then had the front "new" rotors turned. After reinstalling them all was good.

A few hundred miles later the vibration was back. I purchased genuine mercedes pads for the front and rear and had the front rotors turned again. Once again all was well.

The vibration is back again. I noticed a "fluid" coming out from the upper control arms so I replaced the upper control arm bushings.

That did not resolve the issue.

The calipers do not appear to be binding.
The caliper pins are cleaned, lubed and move freely.
I have re torqued the wheels to 80ft pounds with the wheels both hot and cold.
The suspension components seem good and tight. (including tie rod ends).

Any other ideas?

Thanks in advance for your help!
Joe