Looks like rail has something in between, better to dismantle whole and refix it. During the course you will the culprit. Show to any upholstery guys and they can remove and re fit in less than 50 dhs.
Brake drums shud be polished on every brake pads change and once the thickness reduces it shud be changed. It shud have atlast 5mm of thickness on eithr side. Show to your mechanic and even lathe guys who polish will tell that it needs change now.
2010 GLK brake lights need to changed
can i do it my self or do i need an expert
if i can i would appreciate if somebody can post me the steps
thank you