i have been having this recurring intermittant problem for the last 2 years.i renewed the emergency brake pads and it solved the problem for about 4 months now the problem has returned.
problem is this....... sometimes as the car gets warm the left rear wheel starts giving a thumping sound ,on acceleration.the noise goes away when the foot is removed from the accelaratoror when the car is coasting.
is it the drive shaft or the bearings,or the brakes..the sound is like something is touching as the wheel turns.
please help...its driving me crazy.if it was the bearings or the driveshaft would not the noise stay all the time.it is NOT a grinding sound....more like as if a hammer is being hit on a drum.

Two things.

Check the lug bolts, some I have seen too long hitting the parking brake hardware.

I have seen a number of half shafts fail.

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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope :)
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM