i have a 1994 explorer. the brake pads keep wearing out on drivers side. in like 8 mo. i paid a shop to replace all rotors, pads and calipers. 8 mo, later same problem. so i personally replaced all rotors, bearings, pads, and calipers again thinking the shop didnt do their job but now same problem. brakes are wearing out in 8 mo. scraping on drivers side now. I noticed that when i drive awhile and i hit the brakes it will pull to the left or right . even after all new is installed. what would cause calipers to stick? im on my 3rd set of pads and calipers in 2 yrs.