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Bench bleeding of Wilwood MC & Combination Proportioning Valve

Discussion in 'The whoa and the sway.' started by Cutlass, Feb 9, 2020.

  1. Cutlass

    Cutlass Platinum Level Contributor

    1. Is there any harm to bench bleed the MC with the Combination Proportioning Valve already hooked up?
    2. Looking for some tricks about the least messy way to install a bench bled system in the car.
    If I understand right, then I have to attach the brake lines while brake fluid is dripping. So I have work fast and have some cloth in the car to avoid brake fluid spilling. Additional I plan to preload the pedal, so that the piston prevents the fluid to leave the reservoir.
    Any better way to do it?
     
  2. Dragdoc

    Dragdoc Well-Known Member

    Im sure I will be chastized by some but I have never bench bled anything! And not had issues either. Have I done thousands? No, but plenty of times - both stock and custom systems.

    Perhaps Im just lucky
     
    Lucy Fair likes this.
  3. Lucy Fair

    Lucy Fair Nailheadlova

    I also didn't bench bleed any MC's and never ever had any problems and mess....
    And i did it a lot, i turn wrenches for a living.

    Peace, Kacper.
     
  4. gstewart

    gstewart Well-Known Member

    I have always bench bled several m/c WITHOUT the prop valve.
     
  5. Cutlass

    Cutlass Platinum Level Contributor

    I will give it a try with below setup. Will report feedback (go or no go) once completed.
    IMG_0111.JPG
     
  6. Bens99gtp

    Bens99gtp Well-Known Member

    Thst should work, I assume you just plugged the other front outlet???

    I would put in on the car with those hoses still in there till lines are formed and ready to go
     
  7. Cutlass

    Cutlass Platinum Level Contributor

    I will mockup everything in the car w/o brakefluid, bending the lines, etc., so that everything assembles quite good. Next I will remove the Master for the bench bleeding and afterwards reinstall it the way you described it. Thanks!
     
  8. gstewart

    gstewart Well-Known Member

    I actually have a a Motive Products power bleeder but have not had the opportunity to use it.
     
  9. Cutlass

    Cutlass Platinum Level Contributor

    I got the huge cover plate from motive for pressure bleeding.
    Was not impressed with the enclosed chains and J-rods for attaching the cover on the reservoir.
    IMG_0131.JPG
    So I decided to use the J-Rods, but with a steel band.
    IMG_0130.JPG
    Performed a pressure test w/ air, but was not able to get the cover sealed. Worst thing would be brake fluid spilling or squirting once installed in the car.
    So I decided to go overboard and to use some leftover material I had lying around.
    Pressure test was ok and I will get some wingnuts, so that I do not risk overtightening and bending the cover.
    IMG_0127.JPG IMG_0128.JPG IMG_0129.JPG
    Guess that will do :)
     
  10. HotRodRivi

    HotRodRivi Tomahawks sighted overseas

    that is totally friking awesome.
     
    Cutlass likes this.

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