Hello. The rear caliper on my 1990 blaster is giving me some trouble. When I first bought the quad it wasn't working at all. It felt jammed. I opened it up, greased the inside, lubed up the brake cables and put it back together and it did the same thing. I noticed that when the 3 bolts that hold the caliper together are loose, it works perfectly. Once I tighten them up, it jams. Any ideas? Thanks!