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could someone explain why my 70coronet brakes perfectly with NO prop valve at all? i put an 73up A body disc setup up front and retained 10 inch drums in back. i was going to get an adjustable one but since it drove fine been about 5 years now. are my drums maybe just pooched? i've been curious about it ever since. sorry to hijack.

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Same here on my 70 Dart and 72 sat. Converted to disc, never put a prop valve on either, just used the correct master cylinder and it works fine. No wierd brake wear or anything. Not saying that will be the case on all conversions, maybe I just got lucky.