if you are talking about the flat rectangle valve all the lines under the master cylinder go into then out to the wheels they should be the same . if you mean the round valve drum doesn't use it . the brass valve on the side of the sub frame is front for disc
Yup -- stock setup had a distribution block under the master/cyl that was the same for all systems.
Stock disc/dum setups had a round hold-off valve that delays front brake operation until the rears grab a bit (apparently needed to make sure light brake application would stop the rear wheels from spinning when stopped at a snowy intersection).
Some stock applications also have a proportioning valve mounted on the driver's side of the subframe (under the driver's door area).
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