How to pressure-bleed the brakes on a B-van?

I made up a pedal hold down. As a last resort i use it. When i have no helper or he’s an idiot and wont listen. 668CDC4E-49FE-4EB7-A0FB-7D3F0C048C60.jpegPointy end on pedal, push rod down to hold pedal and flat bar against front of seat. Need more pressure, push pedal with foot and lock it in place. Flat bar is 1/4” thick and it grabs rod nicely.
Also good for brake light diagnosis.

It makes for a lot of back and forth, but waiting for someone to come help usually takes longer.