Thanks for your time.
HouseCallAuto 4/29/2010I'm more inclined to suspect the master cylinder. Try this though. Unbolt the master cylinder from the booster leaving the brake lines attached. Install a single steel flat washer under the master cylinder ear mounts and reattach it. See if this condition repeats itself. If there is too low a brake pedal after doing this just remove the washers. I have never heard of a booster on any car causing a brake drag, or at least I have never been in on one that the booster was the fix. If the washers fix it, pull the master back again and see if the pushrod in the booster is adjustable and try to shorten it keeping track of the turns so you can "undo".
HouseCallAuto 4/29/2010Another thing to try is to disconnect vacuum from the booster just for road test purposes. It will be very difficult to stop but if the dragging stops it would give credibility to the bad brake booster Idea.