I changed my front brake pads, and there we good for a few weeks. Now they are making a grinding noise when I start to coast at any speed. It actually causes my truck to de accelerate, it seems to go away when I step on the gas but there its a clunk noise when ever I hit the gas pedal. Is it misaligned pads? Stuck caliper piston? When I installed the pads I used an old brake pad and c clamp and fully depressed the caliper piston and it didn't take much force to do so. How ever I didn't pay much attention to the slide pins. Its really starting to worry me!