Good to know, I must have just got lucky because the last few mc replacements I have done were " bench bled" on the vehicle with a friend on the pedal because I don't have the arm strength to do it on the vice
Bottoming the piston is not required to bleed it.
Otherwise you couldn't bleed a used master due to it not being recommended to make the piston travel more than it's normal working stroke.
This is because making one travel more than it normally does when driving can kick up junk settled in the bore where the piston doesn't normally travel causing piston seal failure.
When I bleed a new master I put it on the vehicle with a towel under it and the fittings connected.
Then pump the pedal a few times to get fluid moving, and then crack each fitting and use short light strokes (like if you were just trying to get the brake lights to come on.)
Short light strokes doesn't give air a chance to suck back in.
Try it some time.
I am a big proponent of being able to do things without help and learned that this works. (probably before you were born):D
It even works when bleeding at the wheels believe it or not.
