Help with Drum Brakes

[Rusty Nail]

I concur. It is properly the inside diameter measurement which you seek.

 

[pduffyd]

I agree with Rusty, for a C20 3/4 ton 14BFF. My backing plate dia' is about 14.25". I have not taken the rear wheel off to measure the outer drum dia' but it is stamped that the inside dia' for service life of the brakes is 13.09" max. I know the shoes to order are for 13 x 2.5" brakes (JB7).