Has been a while since I posted. It also has been a very long time since I owned one of these earlier models but in gas. I might take the vacuum feed off the booster and see if there is any difference.

Also wonder if you have good vacuum to the booster. There is in the later models and probably in yours a vacuum retention check valve in the line to check.

Not a terribly complex system to deal with. First of all in my aged mind. Make certain each front brake caliper is actually on the right side. Bleed nipple has to be at the higher end of the caliper fluid chamber or you are fighting two air pockets.

Last thing that occurs but unlikely. I cannot remember the change year from rear drums to rear rotors. The brake master cylinders will not be the same. Check the casting part number and compare it to a good source. Even a wrong part in the right box is not unknown.

I tend to test things. That tee in the parts view could be an equalization valve. Bad or good it would not give you a low pedal.

I see... so it must be this type of plate (see attachments).

It's actually a bolt(a hex head pin rather), spring and pressed-in cam plate...

The Chilton says "turn the cam bolt until definite drag is felt ,then back off the bolt until wheel turns freely again". This should be all to the shoe adjustment (parking brake has a different procedure).

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Haven‘t been able to work on the car lately, it stalled last time I had it running. Fingers crossed that it‘s just clogged filters. I had thought I fixed my stalling problem when I installed new check valves in my fuel lift pump. I plan on working on it in the next few days, I‘ll report back then and let you all of any new updates! Thank you all for responding and for all the information!

__________________
1979 300D, sold
1984 300D, totaled
1984 300D, sold
1982 300TD, sold to Dad
1976 240D automatic unfortunately; gone, but not forgotten.
1974 240D manual, sold
1981 300D, sold
1983 300TD, no rust, sold
1979 240D manual, rear-ended
1965 200D, four-on-the-tree
1982 300SD
1985 300D
1984 300CD „Rusty“
1980 300SD
1982 240D 4-spd.