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HELP..... no brakes.

Brakes

  1. Mopar vance

    Mopar vance Member

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    I have a 72 rally, just installed front disc brakes. Problem is no pressure, do I need the 2 piece proportioning valve set up.
     
  2. Adam

    Adam Well-Known Member

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    Hard to say with no info, or pics. Yes, you should have a proportioning valve for proper function, but you should still have pressure. Did you put in the correct master cylinder, is it correctly connected to the brake pedal or booster rod long enough; are the lines hooked up properly; did you bleed the brakes; are the calipers on the correct side; rubber hoses in good shape....

    post some pics.
     
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  3. Chryco Psycho

    Chryco Psycho Well-Known Member

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    72 would ave a 1 piece proportionin valve
     
  4. Mopar vance

    Mopar vance Member

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    Does this set up look correct. From rear of master cylinder to top of valve for front disc, front of master cylinder to bottom of valve for rear brakes

    20200801_120505.jpg
     
  5. Chryco Psycho

    Chryco Psycho Well-Known Member

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    te front line from te master feeds te rear brakes & sould connect to te bottom of te proportionin valve , te rear line from te master feeds te front brakes left & rit at te top of te prop valve
    It could be a 70 style proportionin valve , not 72 style .
    I am missin letters between F & I bit I believe you can understand !!
     
    Last edited: Aug 1, 2020 at 5:51 PM
  6. moparleo

    moparleo Well-Known Member

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    " No pressure" Does that mean that you have no pedal and it just goes to the floor, even after doing a proper bleeding of the master cylinder on the bench and then bleeding the entire brake system staring at the right rear wheel ?
    Did you piece meal the conversion yourself or get the info from an article ? Or bought a conversion kit ? What are we working with ? What parts did you use ?
    We need details. When you go to the Dr. and just say " I don't feel right " He is going to ask exactly what doesn't feel right and what does "feel right" mean?
    Help us to help you.
     
  7. Mopar vance

    Mopar vance Member

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    Factory booster, master cylinder, brake calipers. New lines, proportioning valve. Went from manual to power. Pump the hell out of the pedal ok, let off and too the floor. Don't see any bubbles when bleeding the lines
     
  8. Chryco Psycho

    Chryco Psycho Well-Known Member

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    Bleedin brakes you must pump slowly , you can aerate te fluid pumpin rapidly.
    Are te calipers mounted correctly , te bleed screws must be at te top of te caliper mounted correctly so air is removed .
     
    Last edited: Aug 1, 2020 at 5:56 PM
  9. Mopar vance

    Mopar vance Member

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    Bleed screws located at the top. Would there be a difference between the manual and power brake push rod.
     
  10. Rapidfire

    Rapidfire Well-Known Member

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    Yes, the push rod is longer on power brakes!
     
  11. Mopar vance

    Mopar vance Member

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    Does anyone have a measurement?
     
  12. Rapidfire

    Rapidfire Well-Known Member

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    I don't have an exact measurement as I have manual disc brakes, and my push rod is 7 1/4 so the power one will be longer. Mancini racing sells ajustable push rods!

    image.gif
     
  13. Mopar vance

    Mopar vance Member

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    Thanks. Ill check all yhis out today. Muggy raining day in ohio.
     
  14. Chryco Psycho

    Chryco Psycho Well-Known Member

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    the pusrod is attached to the booster wit power brakes & uses a unique mechanism between the pedal & booster .
     
    Last edited: Aug 3, 2020 at 8:10 PM
  15. moparleo

    moparleo Well-Known Member

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    Factory as in all Mopar parts for a 72 Challenger ? No specifics, good luck.
     
  16. Chryco Psycho

    Chryco Psycho Well-Known Member

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    picture of linkae

    powerr brake linkae.jpg
     
  17. Mopar vance

    Mopar vance Member

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    Yes that's the set up
     
  18. fasjac

    fasjac Well-Known Member

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    The parts look good but, I would check the m/c bore size. I’ve seen this cause many headaches with barely having brakes to a cure for the problem by changing the m/c to the correct (usually smaller bore) cylinder. JMO
     
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  19. Mopar vance

    Mopar vance Member

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    Thanks for the info. Ad that to my list.