Ok, here's the deal. I put a new rear tire on my 01 WR426 and now when I use the rear brakes they aren't doing anything. This wasn't a problem before I swapped the tire. I looked in my book (which sucks) and I've tried to research it on Google with no luck. In looking over the rear brakes/rotor I grabbed the rear brakes and they have a little bit of slop (slightly move back and forth) on the rotor. 1. Should there be this slack between the pad and the rotor? 2. How do I tighten this slack and properly adjust the brakes?