Check the adjustment rod behind the master cylinder that goes into the booster. If it’s touching it will be applying pressure even without pushing the pedal. I had same issue this spring.
Thanks, I misread that before. I was assuming he meant the rod at the pedal. I have a new master on the way and I'll get the booster rod checked too.From earlier replies in this thread:
If there's not the tiniest bit of slack in it per the spec in the factory service manual, it can apply constant pressure to the master cyl and make your brakes drag.