Alright. Here is how you bench bleed the Master cylinder ON the car. First, level the master cylinder on the car. Jack it up in the back if you have to. Get the MC LEVEL. Now get someone inside who can FOLLOW instruction. Get them to depress the pedal down ONE TIME and hold it TIGHT. Now, loosen the rear line on the master cylinder. Let it drain fluid and air....or dead aliens or whatever, then close it. DO the same with the front. ALL THE WHILE your helper is holding the pedal hard. Make sure the pedal goes to the floor each time. DO NOT pump the pedal multiple times during the bench bleed. Only go down ONCE each time. After you tighten the second fitting each time, your helper can release the pedal. Then repeat until you get solid fluid out of the master cylinder. Done. From there, you can gravity bleed starting from the right rear, left rear, right front, left front. In that order. Then you should be getting somewhere.