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1967 gt-500 power brakes

Discussion in '1965-1970 Shelby Mustang GT350 & GT500' started by curtgt500, Mar 24, 2006.

  1. Mar 24, 2006 #1
    curtgt500

    curtgt500 New Member

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    On my 67 gt-500, when I release the brake pedal the brakes stick for about one second. The booster is only a few years old. I removed the master cylinder and adjusted the push rod per the service manual. Put all back together, does the same thing. I disconnected the vacum line to the booster and found out that brakes release in right away. Could it be the master cyl or does it still sound like it's out of adjustment? I'm using dot 5 fluid.
    Thanks
     
    curtgt500, Mar 24, 2006
    curtgt500, Mar 24, 2006
    #1
  2. Mar 24, 2006 #2
    daltondavid

    daltondavid Well-Known Member

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    Did you fully flush your system before going with Dot 5??
     
    daltondavid, Mar 24, 2006
    daltondavid, Mar 24, 2006
    #2
  3. Mar 25, 2006 #3
    curtgt500

    curtgt500 New Member

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    Yes,I flushed the system before I switched to dot 5 sometime ago.
     
    curtgt500, Mar 25, 2006
    curtgt500, Mar 25, 2006
    #3
  4. Mar 26, 2006 #4
    Texas Swede

    Texas Swede Well-Known Member

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    Hi,
    To me it sounds like the booster valve.
    Texas Swede
     
    Texas Swede, Mar 26, 2006
    Texas Swede, Mar 26, 2006
    #4
  5. Mar 26, 2006 #5
    OVERRIDE

    OVERRIDE Well-Known Member

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    Check the inside of the hose from the intake to brake booster valve . they break down from the inside.

    Mike
     
    OVERRIDE, Mar 26, 2006
    OVERRIDE, Mar 26, 2006
    #5
  6. Mar 26, 2006 #6
    GT52

    GT52 Active Member

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    Though not very old, your booster is going bad. This is a common mode of failure. In 34 years I've had 5 on my KR...and the one on it right now is going bad exactly as you describe.
     
    GT52, Mar 26, 2006
    GT52, Mar 26, 2006
    #6
  7. Mar 27, 2006 #7
    curtgt500

    curtgt500 New Member

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    Thanks, I think your right. I changed the master cylinder. No help. Is there anywhere to purchase a new booster that doesn't come with the master cylinder? Mine is brand new and it's the first one that doesn't almost hit the valve cover.
     
    curtgt500, Mar 27, 2006
    curtgt500, Mar 27, 2006
    #7
  8. Mar 27, 2006 #8
    GT52

    GT52 Active Member

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    Yes, most of the major retailers sell these "unloaded"...meaning without the master cylinder. You could also have yours rebuilt...check Hemmings for "Booster Dewey"...just one of several who advertise this service for about $100.
     
    GT52, Mar 27, 2006
    GT52, Mar 27, 2006
    #8
  9. Mar 27, 2006 #9
    curtgt500

    curtgt500 New Member

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    Thanks
     
    curtgt500, Mar 27, 2006
    curtgt500, Mar 27, 2006
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