The side which is wearing out more quickly has got to be dragging/binding . . . OR, the side which is not wearing out as quick might not be engaging/braking with sufficient pressure. At 185k, I’d think about a new caliper for BOTH sides. They come “loaded” and aren’t too expensive (I never go cheap on brake or suspension stuff). Why don’t you take the pads out and give it a good cleaning, lubricate all the moving parts, like where the yokes slide against each other? If you chage the pads, this isn’t too much of a leap for you to do yourself. Even the change of caliper isn’t that big of a job. Good luck! Rocketman