Truck is a '69 Ranchero 302 C-4 power front disc-brakes. The issue has been present since I bought it. The brake pedal has a lot of travel before any brake engagement actually happens, and once it gets to a certain point that the brakes are actuated, it's like 100% full power assist and wants to throw you through the windshield. If the brake pedal is absolutely babied, you can get it to stop normally if you push through all the sloppy travel extremely slowly. Here's what I've done to solve it. New master cylinder, new rebuilt booster, new calipers, new pads, new front hoses, new rear wheel cylinders, rear brake adjustment. I had the wheels off the other day and I noticed the RF rotor didn't spin easily. I pulled the caliper apart and greased the slide pins. Test drove it, and it felt pretty good. However, it got worse and worse until returning to the previous condition. I have also noticed that the RF rotor is much hotter after driving. I'm thinking at this point, either I replace the RF caliper or I take a look at brake pushrod and master cylinder as I've been told a drum brake master cylinder could be causing my issues. Anyone have any bright ideas?