Re: What\'s this scraping noise when turning?
I had the same problem on my 83 scrambler, deep grooves on the inside one the passenger brake caliper. I figured I had ruined the rotor but it still stopped well and tracked straight on braking so I figured I may as well use em till they were totally worn.
Anyways, 7 months later they were totally worn so I ordered the entire brake set (calipers, rotors, pads, etc for $240). If your calipers aren't centering then you should replace the rubber insert between the caliper and the caliper pins. The entire caliper assemble slides on the pins so if the rubber is chewed up or otherwise not smooth you will probably get the grooves.
If fact, when I put the new calipers on I thought there was something wrong since they were so "loose" compared to the old ones, but after studying the system for a bit I decided that was how it was supposed to be.
A new hardware kit costs $15 while a new caliper costs $30 x 2=$60. My calipers were still probably good but I figured for $45 extra bones I really couldn't go too wrong