Thank AndrewH and dvw. I'll plug the MC and do that check.

I'm going to move on from the booster at this point.

On the residual valves (if the MC checks out), I have new manufacture units that theoretically have the residual valves built in along with a late model MC, with no residual valve. How can I check that this is the case?

The back brakes don't seem to be a problem, as in reverse (at reverse speeds) I have better braking than going fwd. This would indicate that an MC problem would be in the front circuit, correct?