My brake caliper on the passenger rear has more movement than my other calipers (it twists to the outside a little - about 1/8th inch) when the brakes are applied. The only thing I can see that would affect this is the pins that hold the caliper to the mounting ( all the bolts are torqued to spec). The tires/wheels are oversized at 275/45/18, and have been for some time which I'm sure has added extra stress on the calipers. My car is a 1991 with 118,000 mi. and is tracked hard 4 times a year. I never have liked the brakes on this car - all else is lovely. Should I replace the pins?