tkeagle,
We removed the brake switch sensor on the master cylinder. Then we re-threaded a standard banjo bolt with a 1/8-27 npt die and fastened the new rear brake caliper line to that port on the master cylinder. After much bleeding and such, the rear brakes work great.
So, the single port was not up to the task of supplying the two rear brakes and your idea put us on the track of trying another available port on the master cylinder. The next step if that failed, was to fix another master cylinder to the machine.
The brake switch sensor wires are re-routed to a vintage standard automotive brake switch on the brake pedal mechanism.
Thanks for your time and thoughts,
Steve-o
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