Prop./ Brake valve - Page 4
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Thread: Prop./ Brake valve

  1. #61
    Full Member mrhotrod's Avatar
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    Re: Prop./ Brake valve

    Try this site they can set you up with all your brake needs and parts

    http://www.hotrodsusa.com/

    Residual Valves: Residual valves are pressure valve use to retain pressure in the lines. The most common use is on a hotrod when there is a floor mounted brake pedal and master cylinder. Mounting the master cylinder (M/C) below the floor positions it below the calipers. Gravity will cause the fluid to flow away from the calipers. The residual valve will retain pressure within the lines. (i.e. 2 pounds residual valve will retain 2 pounds of pressure, 10 pound will retain 10 pounds.) Drum brake master cylinders have residual valve(s) built into the master cylinder. This is needed to maintain pressure against the cup seals in the wheel cylinders. If you are using a disc brake master cylinder or after market you will need to install a 10 pound residual valve for the drum brakes. Do not install a residual valve if your master cylinder already has one in it. This will cause the brakes to lock up after the second application to the brake pedal.

    Distribution Blocks or Combination Valves: One of the biggest misconceptions is the distribution block or combination valve. Almost every factory car has one. This usually serves as a metering block to adjust the proportioning to the rear brakes, as a "T" fitting for your front left and right front brake lines and brake light warning switch. What people fail to understand is that each car is "engineering" for a specific distribution block based on weight, braking characteristics and tires. So generally most factory cars have different blocks.

    Save yourself some headaches install a adjustable proportional valve in the rear brake lines.
    1972 Big Block Scamp 9.21 @ 146mph
    2006 Cummins Turbo Diesel Ram 4x4 Dually

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  3. #62
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    Re: Prop./ Brake valve

    My car is not running yet so I can't say it works, I have a 62 Savoy with 76-79 B- body 11 3/4" brake set up. 2 bolt Alum. MC. I bought from Rick Ehrenberg. Adjustable brake rod from MP. A nice shiny alum distribution block off a Jeep Cherokee that had disks on the front and drums at the back from the wreckers. I am basically using the alum. distribution block just for connections. I have a MP adjustable proportioning valve ready to go into my rear brake line mounted on the frame with the knob sticking through the floor by my seat. That is mainly for ease of adjustment and so No one can mess with it. Like I said the car is not on the road yet, but I think the System is Sound. Jack
    Jack

  4. #63
    BBD LEGEND b569rr's Avatar
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    Re: Prop./ Brake valve

    This is a combination distribution block and proportioning valve from Stainless Steel Brake Company. it will set you back about $130. Placing it under the car per someone's suggestion frees up space near the headers.

    Tom

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  6. #64
    Newb
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    Re: Prop./ Brake valve

    what's the part number stamped into the factory brass version of the valve?

  7. #65
    Rick_Ehrenberg
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    Re: Prop./ Brake valve

    I strongly advise against using that old cast iron stuff. Just leave the stock brass safety switch tee unmolested, and install an adjustable valve anywhere in the rear line. Adjust it on a damp road so that the fronts lock just before the rears.

    The metering valve is kind of useless for most of us. It's also called a "standoff" valve, the purpose was to hold off applying the front brakes until the rear shoes had overcome the return spring pressure, to prevent low-speed front wheel lockup on glare ice!

    Rick Ehrenberg

  8. #66
    Rick_Ehrenberg
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    Re: Prop./ Brake valve

    Quote Originally Posted by mrhotrod

    Residual Valves: Residual valves are pressure valve use to retain pressure in the lines. The most common use is on a hotrod when there is a floor mounted brake pedal and master cylinder. Mounting the master cylinder (M/C) below the floor positions it below the calipers. Gravity will cause the fluid to flow away from the calipers. The residual valve will retain pressure within the lines. (i.e. 2 pounds residual valve will retain 2 pounds of pressure, 10 pound will retain 10 pounds.) Drum brake master cylinders have residual valve(s) built into the master cylinder. This is needed to maintain pressure against the cup seals in the wheel cylinders.
    Virtually any Mopar wheel cyl mfg, after 1975 uses either high duromoter plasticized piston cups, or "expanders", so RP valves are redundant. Every Mopar M/cyl mfg. after '75 DID NOT have RP valves.

    Of course, if, as MrHotrod says, you have a 'rod where the m/cyl is lower than the calipers or wheel cylinders.... ;->

    Rick Ehrenberg

  9. #67
    jwmotors
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    Re: Prop./ Brake valve

    Why can't you run your rear line straight from the master cylinder port to the back where you split it to the wheels and run the front to the line lock and use that for your tee ?

  10. #68

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    Re: Prop./ Brake valve

    Just got done referring to a '77 service manual and they are still showing both the brass and cast combination valves (warning switch/ hold off or stand off / proportioning valve) for both the Volare and Aspen models this year. Both pictures look very similar the blocks pictured here.
    I had one question here are proportioning and hold off valves needed when you are running the same type brakes front and rear. ie either both drum or both disc.
    I had just figured to go after market with the valve since many brake vendors now offer them.

  11. #69
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    Re: Prop./ Brake valve

    Quote Originally Posted by jwmotors
    Why can't you run your rear line straight from the master cylinder port to the back where you split it to the wheels and run the front to the line lock and use that for your tee ?
    because if you do that with no prop valve, the second you go to hit the brakes, the backs will lock up, a prop valve reduces the pressure to the back line, most guy do what you said but they add an adjustable valve in the rear line
    72 duster, getting a 512, looking for a 67-69 cuda to put it in instead

  12. #70
    jwmotors
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    Re: Prop./ Brake valve

    The drum brake dist. block was not a proportioning valve, it is a t on one end and just a single line on the other end built into a brass block that also held the safety switch that would activate the brake warning lamp on the dash and on a drum brake car you do not need one and your wheels won,t lock up as far as disc brakes I don,t know how the brakes would respond without one .

  13. #71

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    Re: Prop./ Brake valve

    Quote Originally Posted by ski
    Here's one.
    I need one of the brass prop valves like ski posted a photo of in the worst way. Does anyone have a lead on one of these? I can't find one anywhere!
    Bob

  14. #72
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    Re: Prop./ Brake valve

    Ok, anybody plumb in the rear adjustible prop-valve after the brass distribution block but under the drivers door? I really don't want to have to lift my car to adjust the prop valve if I stick it directly after the brass distribution block. So I was thinking of cutting the line and adding the adjuster there. I would need to use a double flaring tool to flare the cut ends correct?
    Can somebody knowledgable get me a quick answer as this is all I have to do to pretty much finish.
    MY OLD RIDE HOPE IT IS WELL TAKEN CARE OF
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  15. #73
    jwmotors
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    Re: Prop./ Brake valve

    More fuel for the fire , if you are building a drag car or a car with big fat rear tires you would put the valve on the front brakes so you can adjust more pressure to the rears . The valve does not increase pressure it allows you to adjust the ratio by decreasing the line pressure to the brakes it controls .

  16. #74
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    Re: Prop./ Brake valve

    right but even so 70% of braking is done by the front so if you have skinners and slicks, it would about even out with no prop valve

    so with a normal front tire and larger rears then you would want to decrease the rear pressure,

    its not like you will be locking up the fronts first if you have a decent rear brake setup
    72 duster, getting a 512, looking for a 67-69 cuda to put it in instead

  17. #75
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    Re: Prop./ Brake valve

    Quote Originally Posted by 69 GTS Clonvertible
    Ok, anybody plumb in the rear adjustible prop-valve after the brass distribution block but under the drivers door? I really don't want to have to lift my car to adjust the prop valve if I stick it directly after the brass distribution block. So I was thinking of cutting the line and adding the adjuster there. I would need to use a double flaring tool to flare the cut ends correct?
    Can somebody knowledgable get me a quick answer as this is all I have to do to pretty much finish.
    I built a mounting tab on the subframe connecter and mounted my WilWood prop valve about 8 inches behind the trans crossmember. I can almost lean out the car door and reach underneath the car to adjust it!!
    1975 Dodge Dart Sport 446 auto
    1973 Barracuda 340 auto
    2006 Dodge Ram 2500 Mega Cab 4x4 Cummins

  18. #76
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    Re: Prop./ Brake valve

    Quote Originally Posted by 75Dart440
    Quote Originally Posted by 69 GTS Clonvertible
    Ok, anybody plumb in the rear adjustible prop-valve after the brass distribution block but under the drivers door? I really don't want to have to lift my car to adjust the prop valve if I stick it directly after the brass distribution block. So I was thinking of cutting the line and adding the adjuster there. I would need to use a double flaring tool to flare the cut ends correct?
    Can somebody knowledgable get me a quick answer as this is all I have to do to pretty much finish.
    I built a mounting tab on the subframe connecter and mounted my WilWood prop valve about 8 inches behind the trans crossmember. I can almost lean out the car door and reach underneath the car to adjust it!!
    That's what I'm going to do unless I plumb it to come up between the door sill and the drivers seat so I can adjust it without having to stop and open the drivers door.
    MY OLD RIDE HOPE IT IS WELL TAKEN CARE OF
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  19. #77
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    Re: Prop./ Brake valve

    One more question for you guys:

    I have a stock 68 dart with 4 wheel drums.*

    I have installed Willwood front and rear disk brakes (13 inch up front and 12 inch in back).

    I still have the stock manual master cylinder for the 4 wheel drums and the stock brass distribution/warning light block and all the stock lines.* All the stock parts are like new as this is a very, very low mileage car that I have now put a 402 cubic inch motor in.

    My question is this:

    1.* If I take out the residual valves from the master cylinder can I use that with my new disk brakes?

    2.* Can I still use the stock distribution/warning light block as long as I put an adjustable proportioning valve between the brass distribution block and the rear disk brakes?

    As always your guys help is greatly appreciated and needed.

    You can see pictures of some of the work I have done on this car at www.billchatfield.com


  20. #78
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    Re: Prop./ Brake valve

    ill answer # 2

    you can leave it in their, but you put on some high buck brake kit, i would just pull it out, t the front and plumb the rear to the adj prop valve, i would pull it off and make it look nice, why leave factory parts in their if they are unneeded with 4w disk?
    72 duster, getting a 512, looking for a 67-69 cuda to put it in instead

  21. #79
    jwmotors
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    Re: Prop./ Brake valve

    http://www.strangeengineering.net/catalog/index.html

    Here,s some info some might find useful on the great prop. valve debate

  22. #80

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    Re: Prop./ Brake valve

    I have found a porp valve from a Jeep Grand Cherokee that is almost identical to the 73-76 a body piece. But I think it is for 4 wheel disks. Can I use the Jeep piece with an adjustable valve in the rear drum brake line on my Duster, which has disks on the front? Eventually I will install 4 wheel disks on the Duster but that will be quite some time. If the Jeep piece will work for now it would save some trouble latter.
    Thanks

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