Brakes to soft after conversion

Make sure all lines are super tight with no leaks or air able to get in.

Bench bleed master cyliner before installing. This can be done while on the car still, its just a lot more messy. If any air bubbles get trapped inside MC apparently you can't get them out through regular bleeding.

Make sure mc rod isn't to long, sometimes you need a spacer between firewall and MC to ensure the rod doesn't bottom out in the MC.

Make sure the bleeders on the calipers are on top, inline from the brake hoses below the bleeder.

Adjust rear brakes very tight, the pads should be dragging on the drums.

Bleed brakes from passenger rear, drivers rear, passenger front, drivers front.

If all this doesn't work, then you have a bad MC or are getting air in the line somewhere, replace the hard lines. Once I replaced my hard lines my brakes started working properly and I could get them to lock up the tires.