Quote:
Originally Posted by PbFut
Using the correct master from a non power square body may also give you the correct bias. I don't see a proportion valve in the photo above. I suspect the bore in the master is different, front and rear curcuit, to compensate.
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Prop valve mounts on the frame on a square body.
If you pull up a photo of a '73 master the big and small chambers are reversed from the '74 master shown. The PO of this truck must have changed the master and wanted to keep the lines looking straight so he adapted up and down when all he had to do was cross the lines and they bolted right up. The front line to the big reservoir and the rear line to the smaller reservoir.