I've changed my brake pads and Disks late in April, Lately, I've been having lil problems lately. When I brake, and take off my foot from the pedal slowly, i feel something is shaky, i feel in the pedal it makes a wird noise. I wonder if it could be my calipers that jam or something. Some days i have the problem others i dont ! can someone help me.

 

Your calipers may be sticking or your vacuum brake booster is going. I would pull the front calipers off and make sure the slide action is still working. If not, lube the slides up and make sure the rubber boots are re-installed correctly.

 

If they are sticking,wear on one side of pad, replace ASAP.