Front end problems

I opened a bleeder and it freed up the wheels. The brake pedal is very stiff I think I'm going to try and replace the booster. The fluid and hoses look good. Thanks for all the help I was stuck and I'm new to the forum and all this help is amazing. Where is the compensating port? I also read while the car is running hold the brakes shut the car off while still holding the brake pedal should stay when you let go,means your booster is good mine doesn't stay not sure if it's true but that is why I'm gonna try the booster that and that trailbeast bleeder idea worked. Once again thanks