Picture?

The ones I'm familiar with have 5 total ports.
One on the back center goes to the rear axle.
Two on the side/top are inlets from master cylinder.
Two at about 45 degree angle on the front are for the fronts.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-