The 2 things I would check before more expensive mechanical work are the front rotors, pads, and calipers for warpage and fit, and the tires. I had older tires that still had a fair amount of tread, but had gotten stiff. By the time they got to 1/8" tread, they thumped all the time.
2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)
Click to see 87 300E