I was comming up to a stop light, so i lightly started pushing on the brakes, after a few seconds, my pedal got a little stiff the and the brake pedal started vibrating kinda like I was driving over a bunch of small rocks, so I let go of the pedal and pushed down again and everything was normal. Has anybody else had this problem. I checked my brake fluid and it was just a tad under the full line. Should I just take it in and get the brake fluid flushed? I had my brakes checked almost 3 months ago and my pads and rotor were perfect! I also pumped my pedal after I turned it off and it got stiff, so I know there was no air in the lines.