Testing a Proportioning Valve?

72bluNblu said

Sounds more like an issue with the master cylinder. What’s the bore?

Riding the brakes helping is a little weird. Maybe the master cylinder isn’t pushing enough fluid to the disks under normal conditions? Which is they the fronts come on late but do better if you hold some pressure in the lines by riding ‘em. Or maybe it’s just cooking the rears so it feels like the fronts are better. But even that would indicate not enough fluid is going to the disks, because they should react faster than the drums (hence the residual valves for the drums on the disk/drum cars).

Click to expand...

I replaced the booster a few years back with this:
1970 DODGE DART Right Stuff Detailing Master Cylinder and Booster Assemblies G80011001
So it's a 1.063" bore. I also replaced the calipers and pads around the same time. Is 1.063 the right bore size?

I was also thinking that maybe the front brakes aren't getting enough fluid (pressure), so I bought a new set of hard lines I'm planning to put on while the engine is out (that's why I was also looking at the safety switch). The thinking is maybe there's a blockage somewhere, but honestly I doubt that. However, I never did the full bleeding process described earlier, so that's something I'll do after I replace all the hard lines up front.

I've owned this car a long time and the poor braking and strange pedal feel has been there the whole time, even as I have replaced the master, booster, and calipers.