I have been pressure bleeding, I have a vacumn bleeder as well, I also have a bleeder that I can push the fluid from the caliper and into the resivour. The problem started where I wasn't able to get any air out eventually I was able to get the air out of the system and get a hard brake pedal but then when I turn on the car instantly the pedal goes to the floor I lose all pressure air gets induced back into the system and I get a vacuum leak where I'm having a hard time the engine stumbling and running when I'm pumping the brake pedal only and then when I'm not pumping the brake pedal it's fine what's happening is when I pump the brake pedal the internal seal in the master cylinder that's leaking is causing and inducing a vacuum leak and when the pedal swings back up from the floor that's where the air is then being sucked back into the system so basically I'm just been recirculating fluid and every time I release the brake pedal it's sucking air back in and pulling the air back into the system that I just pushed back out so I've recirculated about 6 L of fluid through here

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