coming home from church today i heard a metalic clunk as i hit a speedbump, but it wasnt on the second speed hump. so i made a not to check if something was loose and kept riding, then when riding i hear another clunk. so i start looking at my front end, lights there, horn works, front caliper and disc is there.... pull in the brake and get nothing. so ride it home (literally 2 minutes away) and check for sighns of fluid leak... cant see anything wet. i then check the caliper.... ive only got one brake pad. i then have a look at my bottom bolt (goes through the bottom of the pads) and its undone, with a gap where the missing pad is. so the question is, what do i do now?? is there a chance that the pistons have dropped out???