Probably same as similar era civilian trucks. The military called the Chevy 1 1/2 ton truck the G506 and I have three to restore. Can get brake shop to reline my shoes but can't find OE lining thickness. 1/4" is what is on my 3/4 tone WWII Dodge, so would that work? Or should I go a little thicker?
I'll hang up and listen.

I will see if I can find the original brake lining thickness for your truck. I have a 1943 1 1/2 ton military Chevrolet. It does not have functional brakes (no fluid) as the system leaks. Don't drive it except for slowly on our property. Have too many other Chevrolets to work on before this one comes to the top of the to do now list.

My guess is the thickness was 3/16" but wear in the brake drums or cleaning up the castings might allow 1/4" thick linings.

If they are 16 X 3 Rear and 14 X 2 front, they are the same as civilian. I have NORS drilled linings if you are interested.
I can't put my hands on my FMSI book right now, but using a tape measure, the fronts look slightly thicker than 1/4 and rears a little less than 1/4 (more than 3/16)

Mike

My brother redid the brakes on his G506 a couple of years ago and the parts came from my stock of civilian stuff. Wheel cylinders are being made. Rears are about $60.00 each, fronts are cheaper. NAPA has nice rear kits for $12.00 each with pistons part number 037?? Jim Carter has return springs. Civilian hoses are current merchandise, I don't know if they are the same as Military. I can get you a number for those.

Mike