Front Drum brake troubles on a 1964 Dart

schlockfink said

Yeah seems pretty straight forward except the drums these days aren't as heavy duty as the New Old Stock drums, they're light weight, out of round, they're warped straight from the chinese factory, and that's probably why people switch to disc these days. But with this ride I'd like to keep it stock with the 13 inch wheels and original hubcaps. I have discs on my 63 Dart wagon kustom and just want to try something stock for a change.

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Same thing happened with Chinesium rotors years back, the castings are done quick & dirty, & aren't stress relieved. When they heat up, they change shape, You can't fix them....well You COULD, but the time to stress relieve them & re-machine them is more than just replacing them w/quality ones. There's also a chance the swap was done half-assed, putting uneven stress on the drum at the hub/studs, not sitting flush on the flange.
Next, look at the wear pattern on the shoes, even? Only on an edge? How's the machined surface appear? If it looks like You could drop a needle on it, & play it like a barrel phonograph, when the brakes warm up they may be pulling out 'til they angle & lose bite then snap back.
Last, are You certain it's not a rear drum transferring the pressure cycles to the rest of the system? I've seen all of these & more, make sure all wheel cyl. pistons are free, etc.
Good luck, & keep Us updated, peace!!