Hi Guys, welcome to the Stovebolt.
I have recently done exactly what you are wanting to do. I have a '38 1 ton with 6 lug hubs.
I changed my front axle to a '51 because of the bigger kingpins, but it will still work with the original. I used my original hubs.
Calipers are from a late 70's early 80's Chevy C10 and the rotors are from the same years K10.
Remove the studs from your hubs, turn the backside of the hubs so the rotors will run true. The rotors mount to the back of the hubs. Install longer studs.
I fabbed up a bracket out of plywood to get the proper shape and fitment. Then I had them made out of 5/8 plate steel.
I used a 1/8 inch thick washer between the hubs and spindle to make clearance for the brake pads. some kits have an offset in their brackets for this.
I bought a non power master cylinder with a 1 inch bore and made a bracket to mount it under the body to the chassis.
It will require residual valves for the lines due to the master cylinder being so low in reference to the brake cylinders.
Don't forget to change the hub bearings to the roller type.
Check out my progress photos on page 5 and 6.
Last edited by Wayne67vert; 07/31/2012 10:32 PM.