I got a 2012 MB that is prematurely finishing the right hand side rear brake pads...and sometimes when driving that side rotor heats up to the extent of smoking that you can see in the mirror and smelling brake material badly.Sometimes runs fine.I have got Meylee pads on that are not lasting more than 5k Kms only on that side wheel.The rest of the pads are all good.There are no fault codes on the cluster. The caliper is floating freely side to side on the sliding pins.The piston is moving freely as well when compressing it back in the caliper.Brake fluid is clean.

The car is sitting on135 000kms mileage.Auto.Any leads on what to check please.