check the bleed instructions on the m4's the video is for minis, they may be different.
the old minis you can bleed like a car, most mtb brakes don't respond to that kind of bleed, often you push fluid back up the system using a couple of syringes (like avid and formula)
if you cut a hose carefully you may just need to tie the lever to the bars overnight and keep the master cylinder higher than the caliper then pump the lever.
check the bleed instructions on the m4's the video is for minis, they may be different.
the old minis you can bleed like a car, most mtb brakes don't respond to that kind of bleed, often you push fluid back up the system using a couple of syringes (like avid and formula)
if you cut a hose carefully you may just need to tie the lever to the bars overnight and keep the master cylinder higher than the caliper then pump the lever.