Yes. And they must be arced to a slightly smaller diameter than the drum surface so that when the brakes are applied the pressure from the hydraulic system can push the ends out to the surface. Since getting the shoes arced to exactly mate with the drum surface (which will vary with temperature) is near impossible it is much better to be a tad under diameter than over, which would cause the center of the shoes to not meet the drums surface and pressure exerted on the shoes by the hydraulic system cannot make up for that situation.
I say this as back in the day arcing to a slightly smaller diameter was pretty much standard procedure but nowadays such information is not so well known.
For cars with Bendix type brakes later production shoes did not need arcing as they were made to be flexible enough and under size enough to allow for full contact with normal hydraulic system pressures. But he center planes always need to be arced.
John Hagen
From: Forward Look Mopar Discussion List [mailto:L-FORWARDLOOK@xxxxxxxxxxxxx] On Behalf Of debenson2
Sent: Saturday, June 29, 2013 11:27 AM
To: L-FORWARDLOOK@xxxxxxxxxxxxx
Subject: [FWDLK] rear brake shoes and arching them
When replacing rear brake shoes on a 1956 must they be "arched"? or something I cannot recall the name but made to conform to the drums for better contact? Is this a true thing?
debenson2
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