I just bought a 2006 Mastiff. It appears somebody put new pads on the front and rear the rear work fine the front doesnt stop very well and when comes to almost complete stop makes a noise. Not a squeak but like a vibration and can feel it in the bars. Also in only a couple miles the rotor turns black. Its not hot and can wipe off also looks like fibers like the pad is coming apart or something. Cheap pads? Havent taken apart yet going to this week.