Do factory equipped vehicles always have same size drums front/rear?
Four wheel drum are not always the same size. They may have been the same diameter, I'm not positive, but at least one car I owned had 11" and wider shoes on front than rear, and it seems like they were smaller dia. on rear. So they are "at least" sometimes different width.
Here's a random example out of the Raybestos catalog, page 121, for elderly Coronet
https://www.brakepartsinc.com/dam/i...-0c6474260927/2019-Pads-and-Shoes-Catalog.pdf
Notice that the upper section is front, and the bottom section rear brakes
Notice that some used 11x3 front, but no such width is listed for rear Also notice some rear are 10 x 1 3/4 and that width was not used on front
Four wheel drum are not always the same size. They may have been the same diameter, I'm not positive, but at least one car I owned had 11" and wider shoes on front than rear, and it seems like they were smaller dia. on rear. So they are "at least" sometimes different width.
Here's a random example out of the Raybestos catalog, page 121, for elderly Coronet
https://www.brakepartsinc.com/dam/i...-0c6474260927/2019-Pads-and-Shoes-Catalog.pdf
Notice that the upper section is front, and the bottom section rear brakes
Notice that some used 11x3 front, but no such width is listed for rear Also notice some rear are 10 x 1 3/4 and that width was not used on front
