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Brake booster bad ???

Discussion in 'Early CJ5 and CJ6 Tech' started by Bomb bee, May 1, 2010.

  1. May 1, 2010
    Bomb bee

    Bomb bee New Member

    Nova Scotia,Canada
    Joined:
    Feb 25, 2010
    Messages:
    22
    Hey Guy's
    I finally got my dauntless going today but when it starts the vacuum pulls the brakes on .... it's a 68 cj-5 with a newer firewall mounted booster. Does anyone know the routing of the vacuum inside the booster ,or is it just fried .

    Thanks:cry:
     
    Bomb bee, May 1, 2010
    #1
  2. May 1, 2010
    dnb71R2

    dnb71R2 SuperDave 2023 Sponsor

    Grand Mesa, CO
    Joined:
    Aug 13, 2006
    Messages:
    1,362
    Have you made sure that the modified brake pedal and/or push rod is not inadvertently actuating the booster?
     
    dnb71R2, May 1, 2010
    #2
  3. May 1, 2010
    termin8ed

    termin8ed I didn't do it Staff Member

    Mason, MI
    Joined:
    Dec 22, 2002
    Messages:
    4,422
    basicly you have vacum on one side and atmospheric pressure on the other. there are a series of seals and diaphrams that help boost the brake pedal pressure. If something inside is bad, thats it.
    you get a new booster with the seal;)
     
    termin8ed, May 1, 2010
    #3
  4. May 2, 2010
    Bomb bee

    Bomb bee New Member

    Nova Scotia,Canada
    Joined:
    Feb 25, 2010
    Messages:
    22
    Yep sounds like it's bad ,as soon as the engine starts the brake lights come on and it's darn near impossible to move .
    Thanks
     
    Bomb bee, May 2, 2010
    #4
  5. May 2, 2010
    kaiser_willys

    kaiser_willys Well-Known Member

    Joined:
    Jan 7, 2007
    Messages:
    1,524
    think i would go back and recheck your pedal assembly. every booster i have seen go bad loose their vaccuum
     
    kaiser_willys, May 2, 2010
    #5
  6. May 2, 2010
    Mike S

    Mike S Sponsor

    Cameron Park Ca.
    Joined:
    Oct 6, 2009
    Messages:
    811
    Try disconnecting the push rod from the pedal, make sure the push rod comes all the way out of (away from) the booster can.

    Then start the engine and see if the problem is still there.

    If same issue still exists, replace the booster can.
     
    Mike S, May 2, 2010
    #6
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