When I'm backing up or going forward on the driveway and hit the brakes it makes a clicking noise, loudest when I press on the pedal and a bit less subtle when I let go. It also makes this sound when I go over small bumps. At first i thought it may be a lose bolt on the caliper or knuckle but then I noticed it doesn't make the noise when its stationary only when its moving, even at the slightest movement, when i apply the brake i hear the click! Could this be a bearing issue?