That's sort of what I recall when we tested that first day. With the drum/drum M/C I've had no issues whatsoever.
I'm not sure whether the bore sizing differs or just the bowl sizes between these two. I still have 9" rear brakes too. Though a proportioning valve might help redistribute pressures correctly, there is still the potential that the M/C is bore-sized to be used with a booster, or maybe not. I have a drum/drum M/C for no brake booster (67 Mustang) and operates the disc brakes with no OMG! feeling at all.
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