I changed out the front, left and right side, at 28k and the rear at 34k. The front left was wore out almost down to the indicator lines. The right wasn't too bad. The rear was also about gone when I took them out. I use the rear a lot and expected it to go first. The left front is linked to the back but don't have near the pad thickness as the rear pads. Be sure when you do the pad change out to clean the pucks on the brake calipers good. I used brake cleaner and a tooth brush to get off all the brake dust caked on them. Fred's DVDs are a big help on change and cleaning up the brake system.