Steve, good for you

On the stuck brakes, on the bottom of the master cylinder reservoir there are 2 openings for fluid, 1 large one for pressuring the line and the second is a smaller relief port to depressurize the line.
You have to remove the bottom splash shield to see these ports, and to properly clean the bottom of the reservoir. It’s the small relief port that’s plugged not allowing the line to depressurize.
Cheers mate, Pat.
PS do yourself a favor…click the banner at the top of the page and order 3 master cylinder seal kits from RPM.
(Clutch, front, rear brake) You need a special long nose snap ring pliers to reach the snap ring inside the master cylinder’s barrel. RPM also sells those.
You will get the proper kits from RPM…..with FleaBay it’s doubtful……brakes are important.