I had installed a new MC, and I also took it apart to see if all of the parts looked ok and if all of the passages were open. Also, backing off a bleeder valve when the system is hot will product a stream of brake fluid. However, as they say on "Friends" it is a moo point now. The differential and transmission are now out of the truck to be replaced with more modern units in the coming days. When the truck is up and running again,I will report back here if the same brake problem persists.
Thanks so much for all of the suggested fixes!
