Quote Originally Posted by braundc
does the same logic apply with a tandem MC as on the Dual? I thought a proportioning valve adjusted the fluid flow to the drums to even out the front-to-rear braking? thanks for the help.
it does do that kind of, it lessens the preassure to the rear drums to accomadate for drum brake self energization, a dual proportioning valve can be comsidered a combination valve, there is the prop valve and a preassure differential switch in it ( maby more depending on how many valves and what valves the brake system needs ) which the preassure differential switch will light up the red brake light and shuts off flow of the side with the preassure drop