1. Markuscurillious

    Markuscurillious Well-Known Member

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    So I have a 1973 Plymouth scamp and I redid the whole front disc brakes lines to calipers and there is still a whole bunch a travel before the brakes engage and it seems the rear brakes lock up before front brakes fully stop and ideas???
     
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  2. Biff

    Biff Cheep not easy

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    Are the front calipers mounted with the bleeder up ? At the highest point ?
     
  3. Markuscurillious

    Markuscurillious Well-Known Member

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    Yes
     
  4. 1969383S

    1969383S FABO Gold Member FABO Gold Member

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    ^^^^
    Air some times is hard to escape and takes gravity and pressure to get all the air out. Sometimes in your case 73 up the combo valve may be an issue. Doubtful if the rear are kicking in. Tap on the front calipers with a rubber mallet while bleeding sometimes helps or reverse bleed them.
     
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  5. Biff

    Biff Cheep not easy

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    Then is the proportioning valve tripped , try center it , open the front and rear bleeder to center it you should feel a click in the pedal if it Centers
     
  6. Markuscurillious

    Markuscurillious Well-Known Member

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    Uhmm it doesn’t have a proportioning valve will that help?
     
  7. Dana67Dart

    Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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    If the brake warning light is not on the centering you speak of should not be an issue.

    Did you change the master cyl?

    Of not is it a disc / drum or drum / drum
     
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    • Dana67Dart

      Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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      Photos....

      If you are using a newer 73? Up system components the proportioning valve is part of the diverter valve.

      If you really don't have a proportioning valve then there's your problem. Rear brakes only need about 10% of the pressure of the front.
       
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      • 1969383S

        1969383S FABO Gold Member FABO Gold Member

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        73up had combo valves. That Texas look on the bottom is the rear hold off “proportioning valve”
         
      • Dana67Dart

        Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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        Combo proportioning valve distribution block 69 Up (I thought it was 73 up but online says 69 up???)
        Screenshot_20200403-211348.png

        Distribution block only 68 down

        Screenshot_20200403-211442.png
         
      • Markuscurillious

        Markuscurillious Well-Known Member

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        Front discs al new hoses calipers lines


        I’m p sure stock master cylinders
         
      • Dana67Dart

        Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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        Photos....

        We need photos

        Did you convert to disc
         
      • Markuscurillious

        Markuscurillious Well-Known Member

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        Stock discs I guess I’ll have to check on it I mean I do t think the breaks are supposed to operate like that are they?
         
      • Markuscurillious

        Markuscurillious Well-Known Member

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        What u want pics of?
         
      • Dana67Dart

        Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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        Master cyl
        Front calipers
        Distribution block

        For starters
         
      • Dana67Dart

        Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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        Not the way you discribe
         
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        • 1969383S

          1969383S FABO Gold Member FABO Gold Member

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          First pic It is 73, maybe 72 up!

          the second is 70/71 maybe 72 down. I lose track.
           
          Last edited: Apr 3, 2020
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          • 1969383S

            1969383S FABO Gold Member FABO Gold Member

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            1. This how the 71/72 Or so down was done. They did not use the Newer combo valve. The older used a distribution safety valve and separate hold off/ “Texas”-proportioning valve.

            56BC83A3-A2BA-4B23-9BEC-6563C9A0E606.jpeg
             
            Last edited: Apr 3, 2020
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            • 1969383S

              1969383S FABO Gold Member FABO Gold Member

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              The newer valve can be used on all, but line connections will require some re-bending.

              edit.

              If BB 67-69 and using a heat shield you must use the separate valves! The newer combo valve does not fit under the heat shield!

              809CF245-DB5B-448D-ADF2-1959EF40339D.jpeg
               
              Last edited: Apr 3, 2020
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              • Dana67Dart

                Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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                That's a thing of beauty!
                 
              • 67Dart273

                67Dart273 FABO Gold Member FABO Gold Member

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                Start with the simple stuff. Adjust the rear brakes up until it is TOUGH to turn the wheels. Take a short drive around the block, apply and release the brakes several times, leaving several seconds, say, 15-30 sec if you can between brake applications. Then come back jack up the rear and recheck the rears, tighten them up some more if they have become easier. This is just for testing. See if the pedal "comes up." If not, or very little, you may still have air.

                You may have a mismatch between cylinder size, caliper piston size, and master cyl. bore. A smaller master and larger cylinders makes the pedal travel more, but gives you more braking force. The opposite is true with bore sizes reversed

                Does the pedal feel fairly hard? Judging that is a lot tougher with a booster
                 
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                • Dana67Dart

                  Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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                  Photos man photos. What is so hard to get photos from people.

                  "Doctor I have a bump on my face what is it?" How the heck can the doctor diagnose the problem from just that description

                  If you really don't have a proportioning valve no amount of adjusting or bleeding will fix it.
                   
                • 1969383S

                  1969383S FABO Gold Member FABO Gold Member

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                  Agree with the pics! Likely not their issue though, but it helps when they ask!
                   
                • Markuscurillious

                  Markuscurillious Well-Known Member

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                  Well it’s hard I’m not doing ground up restore just fix the problems it’s hard to see past the frame the drive train and not get transmission oil all over you ik it’s just a pain ig this is why breaks are a pain I’m just pissed cause I worked so hard and it didn’t fix the problem
                   
                • Markuscurillious

                  Markuscurillious Well-Known Member

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                  I have one dad says we might have to get a new one?? Or clean it out idk I’m p flustered
                   
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