I just changed my rear brakes for the first time since ive owned my car. i am about to go get my 4th set of drums and pads in the past 2 weeks because they viberate and sound very bad under braking. As if the drums are warped. I replaced my fronts a few months ago and havent had any problems up there. The rear shocks are about a month old. Also im using CarQuest drums and pads. Any info would help out a lot i leave at the end of the week to go on vacation and would really like to have them working properly on my 900 mile road trip. Thanks!