Brake Questions - Help

dennisonwj said
Someone dropped this list on another forum. I will try to get them MUCH cheaper than that one above.
Manual disc brake compatable cylinders are
101326 M Cardone
MC 36221 Raybestos
18M1019 AC Delco
UP 36221 Napa
SS4736221 Napa

Please educate me if you would, what is a residual valve and why would you remove it? I will of course RTFM on it, but am interested in your expertise on it. I am basically a newb on MCs.
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It's a low pressure one way valve. If it was in the line to the disk brakes, the pistons would have more trouble retracting. There would be 10 psi in the front lines to overcome. Drum brake shoes retract with the assistance of heavy springs. A little pressure in the lines helps keep air out and the pistons ready to go into action.

If your front disks aren't dragging, that much at least is probably fine.