Join Date: Aug 2000
Location: Ft Worth, Tx USA
The first thing I would check is the rod in the booster, most of them are adjustable. When the brakes are locked up loosen both nuts on the master cylinder, if this releases the brakes the rod is to long.
My guess though is, because the car has been setting for a while is the porpotioning,(ok I can't spell that one) but it's the valve by the master cyl that all the lines hook to.
Find the line going to the rear, get the brakes locked up and loosen the rear line at the valve, if the don't release go back to the next fitting, the rubber hose at the diff, loosen it, if that don't release them it's the rubber hose, because you said they released at the bleeder.
The reason you have to start it to lock them up is because the restriction won't let fluid go to the rear until the power booster helps force the fluid through.