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disc brake woes.....

Discussion in 'Intermediate CJ-5/6/7/8' started by 2pwrlftrs4u, Jul 10, 2008.

  1. Jul 10, 2008
    2pwrlftrs4u

    2pwrlftrs4u Member

    Fairbanks, AK...
    Joined:
    Sep 23, 2005
    Messages:
    284
    '74 CJ5 with D44 front axle out of a '78 Waggy

    both of my callipers will not "retract" after using the brakes

    what could cause this?

    callipers and brake shoes are less than 6mo old


    Recent brake history:


    had new lines made about 6-8 months ago at rapid brake

    YJ booster installed memorial day weekend

    i had one pistion sticking and i replaced both callipers with new callipers in Feb/March (less than 5k mi ago but before the YJ booster was installed)

    new shoes with callipers

    rotors are about 10k mi old

    brake fluid is clean... flushed when YJ booster was installed
     
    2pwrlftrs4u, Jul 10, 2008
    #1
  2. Jul 10, 2008
    packrat2A

    packrat2A Member

    McAlester, OK
    Joined:
    Oct 23, 2004
    Messages:
    212
    residual pressure valve sticking maybe? could have some dirt in it from the flushing/install of the booster.


    hey, post up details on that YJ booster install. I need to do that on mine one of these days....
     
    packrat2A, Jul 10, 2008
    #2
  3. Jul 10, 2008
    bkd

    bkd Moderator Supreme Staff Member 2022 Sponsor

    K-Town Tenn.
    Joined:
    Apr 29, 2007
    Messages:
    3,294
    I had that issue w/ my 6...it was caused by the line lock I had put in. Leads me to believe that Packrat2a probably is onto the issue if all your other components are new. So all the rubber hoses are new?
    Jim S.
     
    bkd, Jul 10, 2008
    #3
  4. Jul 10, 2008
    NorCoJeeper

    NorCoJeeper Member

    Ft. Collins CO
    Joined:
    Feb 10, 2006
    Messages:
    470
    Did you swap the proportioning valve for one designed for front disk brakes? I think the residual valve(s) for the drum brakes are in the proportioning valve.
     
    NorCoJeeper, Jul 10, 2008
    #4
  5. Jul 10, 2008
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
    Joined:
    Aug 10, 2003
    Messages:
    23,596

    :iagree:

    IIRC only the drum brakes need a residual valve - disks should withdraw on their own due to the motion of the rotor. There's not much clearance between the rotor and the pad in normal operation, and the pull-back is entirely passive, again IIRC.
     
    Last edited: Jul 10, 2008
    timgr, Jul 10, 2008
    #5
  6. Jul 10, 2008
    2pwrlftrs4u

    2pwrlftrs4u Member

    Fairbanks, AK...
    Joined:
    Sep 23, 2005
    Messages:
    284
    thats what i am thinking... i do have that proprtioning valve but never changed it out...
     
    2pwrlftrs4u, Jul 10, 2008
    #6
  7. Jul 10, 2008
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
    Joined:
    Aug 10, 2003
    Messages:
    23,596
    Some master cylinders have a removable residual valve too. IIRC it's located under the tubing connection seat. Are you using the original master cylinder?
     
    timgr, Jul 10, 2008
    #7
  8. Jul 10, 2008
    2pwrlftrs4u

    2pwrlftrs4u Member

    Fairbanks, AK...
    Joined:
    Sep 23, 2005
    Messages:
    284
    no, its 90's YJ booster/MC
     
    2pwrlftrs4u, Jul 10, 2008
    #8
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