Members with 4 wheel disc systems: Can you lock your wheels?

Exploded view of the 1968-1976 A body 4 wheel drum distribution block:

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After the springs, collars and shuttle is removed, the switch and end cap can go back in, assuming that it is all clean inside. This one isn’t. I don’t have any carburetor cleaner to soak this in so I’m trying this:
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I’ve heard of people using basic household chemicals for parts cleaning.
Lime Away.
CLR.
Tilex.
In 15 minutes, the vinegar is already getting dark.



Awhile back, I considered running the brake lines without a block like this. I bought some fittings…
This for the front.
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This for the rear.

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This would have been a setup where the front and rear were truly separated.

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