The 69 Bonneville has a single chamber master cylinder, I want to upgrade to a dual or separate chamber and a brake booster. I priced a few from the most of the parts sources; Summit, Auto Zone and Rock Auto. I friend " Also and Shade Tree Mechanic" suggest pulling one from a junkyard. Has anyone actually done this with success? In theory it may work, but I would like to talk to someone that has done it.