on one of my rear calipers, i dont know how, but i lost the black cap thats on the back part of the caliper right at the top, it covers the end of the big pin that lets the capliper open up, if that makes sense. sorry, i dont know the name of the parts, or else i could of searched. but if anyone can help me with the name, or even better tell me where i can get a replacement id appreciate it. thanks