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I remember back in the day, we'd not dream of getting a new master cylinder. We'd just take the old one out, get a rebuild kit, hone it out and put it back together.
How corroded are the lines on the outside? As Don mentioned, looking at the condition of the fluid can tell you a bit about internal rust. At least, before taking everything apart, simulate a panic stop by jumping on the brakes full force (you don't have to be driving, the car can be stopped)...
There is a small amount of return from the piston seal.
As the piston moves outwards from its static position (1) the fluid seal is deflected (2). When the hydraulic pressure is released the fluid seal regains its static position, moving the piston back and providing clearance at the friction...
Power steering fluid shouldn't come out. How are your levels? If the level is too low and it starts foaming, it will rise to the top and come out. Same thing if there's a restriction causing cavitation. But usually you'll hear the pump whining in both of those cases.
Besides separating, it can attract any impurities that were harmlessly suspended in the DOT3/4 fluid and cause clumping problems, possibly restricting smaller orifices.
DOT 4 is just better, but no ill effects if you use it instead of DOT 3. It's like putting premium gas in your 318 instead of regular - not going to hurt it.
While I like RE, and have bought stuff from him in the past, in this case he is incorrect. The DOT specs do specify composition, and that's the reason why DOT 3 and 4 are clear or light amber, while DOT 5 is purple, to make sure people are aware there's a difference when they grab a bottle.
The springs should have some arch when there's nothing in the trunk, BUT it also mentions in the Mopar book on suspensions that the best handling is achieved when the springs are flat
Well, last year the offshore Cardone replacements were $100 but they seem to have dried up now.
https://www.carid.com/1968-dodge-charger-brake-parts/cardone-reman-disc-brake-caliper-468169425.html?parentsubmodel[]=SUBMODEL|R%2FT
Although you've replaced the valves, I'd disconnect the passenger brake line at the front metering valve (after the distribution block) to be sure that fluid is pumping from there in sufficient volume. If no, I'd suspect a faulty valve. If yes, then disconnect the line at the brake piston (not...