Everone might do this already, but just in case you don't... Residual check valves are those inline fittings sold by almost all street rod suppliers to keep low pressure on the brake shoes and pads. It is commonly used on disc-drum setups where it keeps 10-lbs of pressure on the calipers and 2-lbs of pressure on the rear drums. Well, I've used the 2-lbs check valves on the front and rear of 3 of my drum/drum cars. The work like a charm. One valve is in-line between the master cylinder and the front brakes and another in the line between the master cylinder and rear brakes. The effect is that you always have a firm, and high pedal even when the shoes need adjustment (and we all know the pre-48 shoes need constant adjustment). If you run a pressure brake switch, then make sure that it is inline between the residual valve and the mastercylinder, else the 2-lbs of pressure will keep your brake lights on. This doesn't eliminate you needing to adjust the brakes, it just keeps your pedal feel constant. Sort of like it feels after you pump brakes that need to be adjusted.
My post probably wasn't clear. I was addressing the drum front and drum rear set ups only. Most of us don't use any residual valves in this configuration. By using 2-1bs in front and in rear will give you the firm pedal. Putting 10-1bs on the front using drum brakes will lock the drums. Hopefully I was a little clearer this time.
Roadstar, I use the 2 lb. on the front & back of mine,.... But then again I've got disc front & rear Later, Mark
Also, if the master cylindar is mounted BELOW the brakes (like under the floor / on the frame rails) you SHOULD use a check valve too.
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