Replaced front rotors and brake pads less than a month ago, and now my right front brake pad is completely gone....and the rotor is totally chewed up! Began to notice a metal grind like sound on the front end, just after putting 2 new tires on the front on the 9th. I first noticed the grinding sound as I pulled out of parking lot, but was in big hurry...the sound got louder and louder. Three days later I looked at my brakes and that's when I found my passenger side brake pad totally gone, and rotor chewed. Yesterday I was able to replace the rotor and brake pad, hoping it was a bad set of pads??? Today, my driver side brakes began making a screeching metal sound....so I replaced the pad on it. (rotor looked ok) Does ANYONE have ideas of what could be causing this problem? Have been told bad calipers???? Bad brake pads???? ***Also, while doing the brakes today I found a .5inLx.16w tiny little thing, metal, hollow cylinder like....., in with the caliper (driver side).....have no idea what it is or where it came from. Just fyi, the only other thing I've done is replace tie rods about 2 months ago maybe???? (actually this is for my son) Thanks for the help!!!!!!
10/22/2015 Update
Well, he got back with me and he is putting on a new CALIPER, as suggested by several wise people here, and brake pad on one side. He went with the one that made the "grinding" noise. I will write back if this does not completely solve the problem. He was told by several people if the brake pads weren't bad when he got them, it was most likely a caliper, but he never felt the classic "pull" to one side or the other, so we were sure it was something else lol....