if anybodyhas any suggestions on this matter iwould first like to say thank you for any input! heres the problem, when you first go to take off and apply the brakes, the rear wheelsgrab hard to the point that they will lock up and drag, have tried to bleedthe whole brake system, to no prevail ,drum is not wet from wheel cylinder leaking, i wasleaning towards front calipers, possible one frozen or sticking, if anyone has ever delt with this sort of thing, once again i'm very thankful for any input. oh andone more thing, after the first time theylock upand get going down the road all seems to be fine until you shut the car off and get back in it and go thru the process all over again. the last thing i want to do is have to take it to GMdealer , but if i have to i have to,