I am saying that IF you still have the original metal brake lines that went to the ORIGINAL MASTER CYLINDER, when you install the P-30 master cylinder, in order to install the lines without adapting anything, the OEM line fittings must be swapped in order for them to screw into the P-30. AS THE ORIGINAL RESERVOIR IN THE FORWARD MOST POSITION IS FOR THE REAR DRUM BRAKES, IF YOU SWITCH THE LINES, THE RESERVOIR THEN BECOMES THE FRONT BRAKES. I didn't say that was right or wrong. ...
It gets confusing since the P-30 fitting sizes are reversed from OEM.
Everything that I know about pressurized fluid in a system is screaming at me that Neil is measuring the output to the front brakes at the master cylinder, and the pressure in the line to the rear wheels everywhere else he has taken measurements.
I think he still has air, or an obstruction, in the rear part of the system. I am leaning towards it being air, but we have to get past the problem if the differential between the points where he is reading pressure. And I think there is still air in one or more of the rear calipers. That is assuming the master cylinder is ok, and I do, despite so many new parts being from China and all that.
But we got to get that difference in pressure figured out before going on to finding the bubble(s). Once we find that the low reading exists all the way from the master cylinder to the rear calipers, we got a good idea there is nothing wrong with the lines, or the combination valve. The problem is either the master cylinder, or air one or more rear calipers. Once we establish which line from the master cylinder goes to the rear, if he has a way to put a gauge on that port and plug the line out of it, we can pressure test the master cylinder.
One step at a time. I found out long ago that most people read the first sentence and the rest has to be repeated.
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