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I understand drum brake master cylinders have a "residual pressure valve" to keep say 10psi of pressure in the brake lines, as drum brakes require this to compensate for spring return tension. However, when you convert drums to discs, you need to remove this valve, or your new disc brakes stay on when you let go of the pedal. How does this work when you go the other way - putting a disc brake master cylinder on a drum brake car? I see Wilwood sell aftermarket residual pressure valves, is this the only way, or can you install a valve in the new master cylinder? JB1762 (15/16") bolts to KE30 booster. It comes from NE Pajero which had factory discs on the back. I'm also looking at Nissan master cylinders from S13 which had discs. JB1608 (7/8") also bolts to KE30, but comes from from NA Pajero has drums on the back, so no issue there I guess.
