I have a Pontiac torrent and im getting alot of chatter in the brake pedal when depressed at low speeds mainly when coasting to a stop and even in reverse as i apply the brakes,i unhooked the sensor connector from the left front and it stops but i faintly can here the chatter still at times but don"t feel it in the pedal anymore. could this be a bad sensor? oh and its a 2006.