'69 brake distribution valve function

[m22mike]

Verne
Here is a 70 differential pressure valve. I think 67 through 70 are the same inside, it is just a simple spool valve. You can see the internals here. It can restrict fluid if the spool is shifted from differential pressure, and they can stick. They are not hard to take apart and clean.

Distribution / press diff block

[Verne_Frantz]

Thanks Mike. Those components are very similar to mine but a little different. On the plus side, I can see the smooth brass rod directly under the safety switch, so it appears that it is not diverted to one end or the other (blocking of any flow). IF that is the case, I'll assume the valve is not my problem. I'll look for kinks in the line to the rear first, then replace the rear hose and see where I am after that.

Verne