A few months after buying this Jeep, wrenching on the weekends and dreaming during the week, I'm wrapping up my initial rebuild of my 74. All lights, gauges, and blinkers work now. It finally drives without wandering all over the road. Just now wrapping up the heater rebuild. Still need to address the wipers. But as I've been working on every other system on the Jeep, I've been researching and acquiring the parts to put disc on the front. I got the adapters from Brennans Garage and all the parts from Rock Auto. Not pictured is a set of Organic pads. My Jeep currently has non-power brakes. As I've searched, I haven't found much info on the intermediate Jeeps getting this upgrade. Specifically, modifying the 74 Master Cylinder for the residual valve. My plan has been to run the non-power MC initially, just pulling out the front residual valve. I ordered a rebuild kit for the MC, if I'm going to pull it apart I may as well rebuild it. The kit includes new residual valves, I'll just leave the front one out. But today I was looking at my existing proportioning valve. I would imagine the valve would have different valving for disc brakes. Now I'm thinking I may want to switch to a 77-86 Power Brake Booster / Master Cylinder setup. Looking at the 74 MC, both front and rear ports are 1/2"-20 thread. The 77-86 MC has one 1/2"-20 and one 9/16"-18 threaded port. If I run that MC I could run the 77-86 proportioning valve. As soon as the MC rebuild kit comes in I'll build it with the stock MC, meanwhile I will start looking for the parts I'll need to upgrade to power if I decide I need to.