Guys since installing new shoes and drums I have a bad vibration while braking. At first I thought it could be the drums out of round. I installed my original drums and the vibration is still there. To confirm it was the rear brakes I used the emergency brake and the vibration was still there. I also noticed while on the parkway that I have a small vibration at 70MPH. It seems as the brakes get hotter the vibration gets worse. I asked my friend who is a mechanic stop by just to confirm I didn't mess up my install and he said everything looks fine. So Im at a loss here, Could it be bad shoes?