Don't mess with the original 9" brakes !!! They didn't work very well in 1950. Buy the 11" drum brake kits for both front and back. I don't know of a simple disk brake conversion for your model 25 front and 44 rear but I'm sure someone makes one. The 11" drum kits work very well and I don't think the disk conversion would be worth the expense unless you are going to be in the water alot. I believe the drum kit parts are old ford 150 brakes. Keep your transfer case E-brake and don't use the rear drum brakes for the E-brake. You can't pull them tight enough with your hand lever.
1960 cj5 gm181 large port 4 cyl., sm465/model18t-case warn od, 5.38's d44 rear truetrac,model 27 front powerlock, bridgestone m/t 30x9.50x15