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Quick google search and found all you ever wanted to know about brake systems.

The Brake Man

Actually, that article is incorrect as to the main function of the residual valve. It's main function was to maintain a slight pressure ( 6 - 25 lbs ) in the line to the rear ( drum )brakes to prevent air from entering the hydraulic system past the lips of the wheel cylinder cups when the brake pedal is released and fluid returns from ther wheel cylinders to the master cylinder. It shouldn't be used maintain clearance between the shoes and the drums. Thats the self adjusters job - or in Dennis's case, his job. BTW, they ( residual valves )were mostly done away with when cup expanders came out in the mid seventy's. If your master is higher than your brakes, I would not use residual valves on ether the drum ( make sure your wheel cylinders have cup expanders - and they should )or disc side. If you do use one on the drum side, go with the 2 lb one. Brake drag of any kind is your enemy. Your return springs will probably over come the 10# one, but why take a chance. Since you are probably not using any self-adjuster hardware, you will have to adjust the rear shows periodically. No residual valve on the disc side. Are you using the porportioning valve that came with your brake system?

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