1966 T-bird lost it's brakes
Put my car in winter storage with a working braking system. In the spring, the master cylinder was empty with no evidence of leaking under the car. I have refilled the cylinder and gotten pedal resistance while bleeding the system. When I start the car, the pedal goes to the floor, seeming like there is no pressure in the lines. Could the booster be bad? I was told to try bleeding the lines while the car is running?