when changing a master cylinder (MC)? I put in a reman MC and now have pedal swing? Low enough that it activates the rear brake light switch. Is the adjustment made under the dash at the brake assembly?

After bench bleeding the reman MC I installed it, then I changed the front disc brake rubber hoses & the steel caliper lines. I picked up an hand held vacum pump to bleed the whole system by myself. Are they any good or should I bleed the system (discs & drums) with someone helping? Thanks. TC

Make sure you bleed the entire system, you shouldn't need to adjust the rod if the MC is a direct replacement.

I'll assume you have a booster with that disc/drum set up, so in that case yes you need to adjust the threaded pushrod on the booster so that you have approx 1/16 (.062) minimum clearance between the tip of the pushrod on the booster, and the inside end bore of the master's piston bore, a set of verniers are handy for measuring the bore depth to determine how much to extent the pushrod, or you can backyard it by adjusting it out until the master is held off the booster, then backing it off until the master sits flush with the booster, then just reduce it another 1/16" so that you don't experience front pad drag because the booster rod is applying pressure in a static position

Thankyou for the pic & advice! TC