Rear line bleeding/ prop valve clogged?.

Discussion in 'Brakes for your Classic Mopar' started by snate66, Aug 12, 2017.

  1. snate66

    snate66 FABO Gold Member FABO Gold Member

    Messages:
    189
    Likes Received:
    61
    Joined:
    Oct 12, 2015
    Location:
    Minneapolis
    Local Time:
    1:46 PM
    Well I searched the threads and of course there is a dizzying amount of posts with my keywords (and I have a Saturdays' worth of garage beers in me) I will poll the masses.
    I just installed the 68 KH front disks, using the MC 36406 master cyl. (Power 15/16 bore), I added the P104 Texas shaped proportional valve for the rear lines and bypassed the original distribution block.
    After bleeding the brakes I don't get the "stop" feel. I went back and bled again, and I do not get much fluid or pressure to the rear lines. Fronts are normal. worked my way back to the Proportional valve. High pressure bursting from the front and the same dribble from the outlet.
    This was new and I feel like it is not letting the pressure through. Clogged?

    Before I removed from the system and opened it up I was looking for any previous experience. I don't believe these are adjustable. Maybe just remove , clean install, re-bleed?
    IMG_0177.JPG
     
  2. breakstuff

    breakstuff Well-Known Member

    Messages:
    811
    Likes Received:
    72
    Joined:
    Jun 11, 2004
    Location:
    earth
    View My Photos
    Local Time:
    4:46 AM
    When my challenger was apart I had one of those mud wasps build a nest in the rubber over axle hose. Screwed with it for a week only to find the blockage there. Check for debris
     
    • Like Like x 1
    • RedFish

      RedFish Well-Known Member

      Messages:
      21,533
      Likes Received:
      1048
      Joined:
      Sep 5, 2007
      Local Time:
      2:46 PM
      The rubber hoses do sometimes collapse inside and block fluid flow, no insect req'd. And just due to the rash of related threads recently,,, check the pushrod / master cylinder travel. The brake lamp switch adjustment can prevent master cylinders full return. This usually results with brakes held on/dragging. I don't know what effect it might have in the bleeding process.
      Some of the OEM type proportion valves are a pain to get centered so fluid flows both ways and the warning lamp stays off. The cast iron one with a tiny button stem thingy at one end? I forget. Anyway... There was a thread where someone said old school method, kick/stomp the chit outa the pedal would fix it. That's all I got. Hope it helps.
       
      • Like Like x 2
      • snate66

        snate66 FABO Gold Member FABO Gold Member

        Messages:
        189
        Likes Received:
        61
        Joined:
        Oct 12, 2015
        Location:
        Minneapolis
        Local Time:
        1:46 PM
        After removing and flushing the little p104 valve, I was able to get a good flow back to the rear. I must have had something work its way in there but would not push through. Bought a bottle of wine for a friend in exchange for the use of her leg to bleed every corner again to double check.
        Should be able to give it a road test tonight if the rain holds off...