Starting with mounting of the hydroboost unit on 76 F100. Used a air chisel to get the lock nut off the HB, and removed the superduty application mount plate.
Cut out a new plate from 3/16 with a 3.25 x 2.125 pattern for the 76 firewall.
Added key tabs to the new bracket to clock the HB unit correctly.
Spacers. Measured the pedal arms; 5 3/16" on vac booster lever arm thingy, 7" HB. So difference is 1 13/16" to put pedal at same location as before. The pedal has two holes, it was configured to use the one that puts the pedal higher. Used 3/8 x 5/8 DOM and faced them on the lathe.
Welded the spacer captive to the plate, however makes installation difficult so cut them back off later.
Brake pedal bolt adapter. The bolt shoulder is 0.557. The ID of the HB arm is 0.636. Odd dimensions. Found a bronze flange bushing that was close that could be machined. Bored out the ID, turned the OD down to fit. Not much left.
Fasteners needed were about 3". Bought some G8 bolts and some black oxide studs. Can only get 3 of the four bolts into plate with HB installed, so went studs. Stuggled to get things aligned so knocked the spacers off and let them float.
Drained and removed the mater cylinder as the lines no longer fit properly. The vac booster moved the MC up from the pedal rod level. HB does not. The lines could be used but I want custom fit.
The actuator rod between the HB and MC is application specific. It was 0.080" too long. Easy to just grind the tip off in place, but I wanted to do a nicer job and removed the rod. Getting the retainer out is a PITA. I got it out but I launched it and the spring to the ceiling. Couldn't find the retainer, dooh! Cleaned up the whole area, eventually found it on top of one of the speaker boxes hanging from ceiling. Shaved off a little at a time until perfect fit.
Got the HB unit mounted, pedal connected and MC bolted up.
