MotoBuddha
Serious Thumper
Offline
Let's roll!
Posts: 1416
Charlotte, NC
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If none of the suggestions above solve the problem, check whether to caliper slides in and out (right and left) easily on it's mounting posts.
There's the curved piece that bolts to the fork leg. That piece has two posts bolted to it. They're hidden by the black rubber boots. The caliper slides onto the posts. Sometimes the posts get gummy and the caliper can't slide in and out. When the caliper piston releases pressure, the pad on the piston side relaxes, but the other pad is left dragging against the back side of the rotor.
You can check if this is the problem without taking anything apart. The next time the brake acts as you describe, push the caliper toward the right side. Then see if the problem persists.
If that fixes it, then you can either live with pushing the caliper over from time to time, or you can take off the wheel, pull the caliper off the posts, then clean and grease the posts and the holes in the caliper they slide into. The posts are slightly hexagonal. The flat areas are there to leave room for grease.
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