I have a 07 s40, I just had the rear brakes replaced in april, about a month ago I noticed a clunking noise coming from the back passenger side of my car, this only happens when the speed of the car is below 50 and when i go over bumps and uneven roadways. The noise stops when I hit the brakes or go above 55mph. The "chain" tire store says its not the brakes,, I dont want to take it to the dealer yet.. any suggestions?

 

Could be your sway bar end links, though I don't know why brakes would have anything to do with it. This is a common wear item. Inexpensive parts and relatively easy to DIY. Just replaced my fronts @ 43K miles, doing my rears next. Definitely cleared up *some* of the clunking noises...

 

stupid thought, but worth asking. are the caliper bolts tight? are the lug bolts tight?

 

Replaced my rear sway bar end links last night. Definitely helped get rid of some clunking. They were rusty and a PITA to remove. Had to use the sawzall with a metal cutting blade to finally get them off. Parts only cost $22 though.

There is still a bit of a knock. Seems higher up in the rear...

 

i have the same problem. it sounds more like the rear shocks/struts are not bolted down tight enough. when it rebounds it feels like there is a lot of play...