1947 brake drum

[Karl Wolf]

Get a brake drum micrometer, or take your drums to a machine shop.
The drum may be machined to a smaller size than 12.000 inches.
OR your shoe linings maybe too thick. There is the possibility that
(if the shoes are new, read- made in China) the webbing could be made incorrectly.

Just in case, I would put a drum into place on the car WITHOUT the shoes
to check for other issues- before machining the drums to 12 inches.

Karl