You would expect both front calipers to lock if there was a problem related to the master cylinder but sometimes it takes less trapped fluid to keep one applied than the other one. That's why we don't want to overlook the easy stuff.
The next thing to try would be loosening the master cylinder's mounting nuts from the booster. If that lets the brake release, something has happened to the push rod adjustment, the brake light switch is holding the brake pedal down a little, or one of the seals in the master cylinder has grown or is coming apart from the piston and not fully retracting. That would be the last thing I would suspect because that seal sits quite a ways away from the port when it's released. You might also look into the hydroboost unit. Remove the master cylinder from it, then watch if the push rod extends when you start the engine. There shouldn't be any fluid there either. If power steering fluid is leaking from in front where the master cylinder attaches, you can expect there's more going on than just fluid leakage.
Sunday, January 1st, 2012 AT 2:17 AM