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Old 11-10-2005, 06:47 PM
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Adjustable proportioning valve for drum system?

My neighbor has a 39 Ford Deluxe Coupe. All four corners have been rebuilt with new wheel cylinders with the drums turned and shoes relined by the local brake shop. We're converting it to a Ford dual drum master cylinder in the original posistion under the floor using an adaptor by Fatman. Because the master will be under the floor we plan to use two 10lb residual valves (of course one for the front system and one for the rear system). All (Wilwood, SS Brakes, etc) adjustable proportioning valves I've seen say something like "to be used in disc or disc/drum conversions".

Question is: Should we plan to plumb an adjustable proportioning valve into the rear system even though the brakes are, and will be, drums all around?

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Old 11-10-2005, 10:04 PM
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Although you wont notice the effect the proportioning valve will have until you do a full pressure brake lockup, you would be wise to install one. Speedway motors sells them for cheap. Check your residual pressure valves to see that they actually work. Plumb it to the master, then adapt a low pressure gauge to the output side of the RPV. actuate the M/C until you see about 20 psi on the gauge. release the M/C. the pressure on the gauge is the residual pressure. I test every one before I install them. I found that 2 or 3 out of 10 of those things don't hold any pressure at all. Hope this helps.
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