My recall is that the drums are the same front to back but the shoes were different sizes. When I had my 57 Pathfinder I had converted to a dual pot master and split the system front and rear and used the larger front shoes on the rear as I had included a proportioning valve.

It's what I remember from nearly 20 years back.

dcneric wrote:

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My recall is that the drums are the same front to back but the shoes were different sizes.

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 Yep.

Front and rear drums are same 55-57 Chevy (and Canadian Pontiac).

Brake shoes are different (2" front, 1-1/2" rear).

Good drums have no grooves inside, and are same inside diameter full width (no "lip" at the outer edge). Nice and smooth inside. Maximum inside diameter 0.060" larger than stock - per factory manual, they can only be turned once:

http://chevy.oldcarmanualproject.com/shop/1955/55csm0516.html

You ought to be able to tell by the outside edge if they have been turned - if it looks like unmolested original metal, then probably not been turned. Or, measure all of yours inside diameter, and the smallest is probably a good starting point for original.

Dave

After checking the drums, none of them are good..

What would be the best and cheapest place to buy new drums, cylinders and hoses?

Thanks