I have a slight problem with my passenger side front brake. When I push in the brake pedal, I can hear the piston(I think it's the piston) squeezing the pad to the rotor. It makes a tick sound. I can hear it a few times while at a stop while pumping the brakes, and then it goes away until I start up again, and then come to a stop, I can hear it again. Has anyone ever heard of this happening?