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I'm getting ready to put a dual port m/cyl on my 54 ford. the supplier says i should get both a metering valve and a residual valve. it is a drum/drum setup and i don't know why i need both.
the residual valve will keep the rear shoes closer to the drums so they react first and the metering valve does the same job by restricting flow to the front. do i really need both or do they just want the $ . fiddyfo
 

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brakin valves

metering valves are only used on combination brakes (disc front, drum rear)....as for the residual pressure check valve you will need that....but they should allready be incorporated in the master cylinder behind the tube seat in the outlet ports. The reason for a residual pressure check valve is to maintain 7-16 psi in the system to prevent the wheel cylinders from leaking. They have lipped cup seals which need the pressure to keep a tight seal on the wheel cylinder bore.......I hope i helped ya.....good luck
 
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