I plan on replacing my master cylinder for one with a larger bore, so I figured while I was at it I’d replace the old adjustable proportioning valve that was stuck and no longer adjustable, and clean out my distribution block as well. The previous owner had a bit of a mix of parts, mainly from what must have been an old conversion from all drum to front disc.
I’ve got a non 70 power brake pedal that has had the correct work done to the hanger, a Bendix Tear Drop style booster, a distribution block with the code D5DA-2B257-AA, looks like the 70 Drum/Drum block, with an adjustable prop valve. For the spindles I believe I’ve got 70 spindles, with the 67 4 piston calipers and brackets, and 67 rotors.
I’m not sure if anything here wouldn’t work with anything else, so far I’ve had no issues but I don’t like how much pedal travel I have before I really feel the brakes, so I’m swapping from a 1" bore to the 1&1/8" bore master cylinder.
While going through the distribution block, I took out the pin and was cleaning it and was wondering how the O-rings and that brass sleeve fit on. I’ve posted a picture below of how it was when I slid it out.
Underneath the brass sleeve to the right of the valley (The Red Arrow) for the brake warning switch, there is a groove that appears to be for a smaller O-ring, such as the one on the left side. The O-ring on the right side (Blue Arrow) fits very snug where it is, however if I got a smaller O-ring I could fit it in that groove I mentioned and have the brass sleeve on the other side of it, such as the O-ring on the left side. I figure the groove is there for an O-ring, however I’ve not taken one of these apart, and this was working fine before so I was unsure of what was correct. Thanks!
