Quote Originally Posted by MacDee View Post
Yeah, we put in Drum/Disc MC. The bowls are dissimilar.
I noticed on one long descent with a stop sign at the bottom that the brakes faded to almost nothing. Then, one of the things that Randy did recently was a brake job on the rear because the shoes were badly worn. The rear brakes were almost new when we did the disc swap, and it doesn't have all that many miles on it since. I suspect the rears have been doing ALL the work!
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.