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    Results 1 to 9 of 9
    1. #1
      Join Date
      Dec 2006
      Location
      California
      Posts
      1,368
      Country Flag: United States

      Proportioning valve before or after residual valve?

      I finally got everything I need to put my disc brakes on and now I'm stuck. The instructions just say get the residual valve as close to the master cylinder as possible, but it doesn't say if it goes before or after the proportioning valve.

      So my question is, which should be closer to the master cylinder? The proportioning valve? Or the residual valve?

      Master cylinder -> residual valve -> proportioning valve -> rear brake line

      OR

      Master cylinder -> proportioning valve -> residual valve -> rear brake line



      Matt

    2. #2
      Join Date
      Jan 2005
      Location
      Dallas TX
      Posts
      1,633
      Are you running drum rear brakes? If not skip the residual valve all together.

    3. #3
      Join Date
      Dec 2006
      Location
      California
      Posts
      1,368
      Country Flag: United States
      Yeah, I'm running rear drums. Soon I'll have 4 wheel discs, but for now I'm sticking with drums in the rear.

      Matt

    4. #4
      Join Date
      Nov 2007
      Location
      Afton,Mn
      Posts
      180
      Residual valves on factory drum cars were in the port on the master.I would put it right after the master before the prop. valve.

    5. #5
      Join Date
      Dec 2006
      Location
      California
      Posts
      1,368
      Country Flag: United States
      Ok I just called Touring Classics and he said not to even run a residual valve. I told him I was running rear drums and he said to first try it with just the proportioning valve.

      I guess that would work, but I just don't see the rear brakes doing much of anything if there's no residual pressure.

      Matt

    6. #6
      Join Date
      May 2005
      Location
      Fontana, CA
      Posts
      4,959
      Country Flag: United States
      Don't worry about RP on a drum car as the stock setup is already equipped for that. Never mind that Drums require less RP than Disc cars (10 v. 2 pounds) so even if you did put an RP valve on it now for the drums you would have to replace it later when you converted to discs.

      Nick R.
      69 Camaro - 383, 700R4, 12 bolt 3.55, Hotchkis, Bilstein, Global West, Morris Classic
      08 HHR SS - Still Stock for now
      Do you still believe in all the things that you stood by before? Are you out there on the front lines, or at home keeping score?
      Do you care to be the layer of the bricks that seal your fate? Would you rather be the architect of what we might create?


    7. #7
      Join Date
      Dec 2006
      Location
      California
      Posts
      1,368
      Country Flag: United States
      Alright, well I'm still stuck. The guy at NAPA said the line size for the rear brakes should be 3/16", so I got 2 feet of 3/16". I get home and find that the rear line size looks even bigger. What size is it? 1/4"?

      The proportioning valve I have has 1/8" NPT threads, so hopefully I can find adapters to fit.

      My other problem is I have no way to bleed the friggin master cylinder. I thought they'd at least send me plugs or bleeder tubes or something, because I'm pretty sure I got those with my last master cylinder, but I got nothing. If I can't find any plugs local, could I just put it in a vice, fill the reservoirs and pump it? I figure I could catch the fluid in a pan and just do that for like 5 minutes and it should be good. Maybe?

      Matt

    8. #8
      Join Date
      May 2005
      Location
      Fontana, CA
      Posts
      4,959
      Country Flag: United States
      No. The MC will take in a little air on the backstroke. If you have any extra fittong for the MC use some extra hard line and go for it. You only need single flares to do this for bleeding purposes.
      Nick R.
      69 Camaro - 383, 700R4, 12 bolt 3.55, Hotchkis, Bilstein, Global West, Morris Classic
      08 HHR SS - Still Stock for now
      Do you still believe in all the things that you stood by before? Are you out there on the front lines, or at home keeping score?
      Do you care to be the layer of the bricks that seal your fate? Would you rather be the architect of what we might create?

    9. #9
      Join Date
      Dec 2006
      Location
      California
      Posts
      1,368
      Country Flag: United States
      Thanks, I found a kit at Kragen for $5 for bleeding master cylinders. I finally got everything on and I went to bleed it and found the passenger rear bleeder valve was broken off. So after replacing both rear wheel cylinders (driver's side was just a precaution), I finally was able to bleed the system.

      I've done everything except install the new master cylinder. It's a universal one and you have to measure and cut it. The instructions say 69 Camaros are usually around 5", but when I measured I only had 3.5" of room. Anyway the pedal is nice and firm and doesn't go down too far, and I'm positive there's no air left in the system so I'm happy with it.

      Thanks for all the help. I've gotta get some 1/4" spacers, but once I get those, I'll get some pics of the new brakes/wheels.

      Matt





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