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brake switch at master

Discussion in 'Early CJ5 and CJ6 Tech' started by pilebuck, May 27, 2010.

  1. May 27, 2010
    pilebuck

    pilebuck Member

    western WA.
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    Apr 28, 2008
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    I have power to one side of the switch other wire coming off the switch when i hit the brakes with a testing light no power coming out.Put test light across the two posts on brake switch and hooked wire to my turn signals and brakelights went on.new brake switch also.new brakes all around drum stock what could be the problem ? i also have ezwire new and turn signals wrk running lights everything else ???? it a 1967 stock master 1 2 wire brake switch help!!!:v6::D:flag:
     
  2. May 27, 2010
    bkd

    bkd Moderator Supreme Staff Member

    K-Town Tenn.
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    either your not getting brake fluid pressure to the switch or the switch is bad......have had both scenarios happen to me
    Jim
     
  3. May 27, 2010
    pilebuck

    pilebuck Member

    western WA.
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    Apr 28, 2008
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    jim new switch what wood cause not gatting brake fluid pressure to the switch new master new brakes new wiring i hot wire to the switch and the other coming off when i hit the brakes i should have power.but i just put new brake switch on and have power coming in but not out use a testing light and press the brakes and no power coming out of switch?could be something when i re did the brakes ?????
     
  4. May 27, 2010
    bkd

    bkd Moderator Supreme Staff Member

    K-Town Tenn.
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    just thinking out loud......if you didn't bench bleed the master before install you may have air in your brake lines.......you could have a "new" switch that is bad, I had that happen with a unit I got from Napa
    if you have power in to one side....the pressure activates a switch to allow power out to the lights.......that's why I say it's either lack of pressure or bad switch
    Jim
    ps, maybe others will chime in if I'm missing something :)
     
  5. May 27, 2010
    EricM

    EricM Active Member

    Southern California
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    Jim, I agree, it's one of the two
     
  6. May 27, 2010
    Walt Couch

    Walt Couch sidehill Cordele, Ga. 2022 Sponsor 2021 Sponsor 2020 Sponsor

    cordele, Ga.
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    No your not missing anything bkd. It's either air in the master or defective switch.
     
  7. May 27, 2010
    MSJ

    MSJ New Member

    temple,tx
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    Aug 6, 2008
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    If the brakes work well with no mushy pedal then I would expect that the pressure is sufficient to activate the switch. I work as an agg mechanic and our machines use a lot of switches for lights, sensors, etc. It's not uncommon to get a new bad switch. I haven't worked on my brake light switches on my cj-5 yet. Can you bench test those switches and ohm it out to see if the switch is bad?
     
  8. May 27, 2010
    hotrod351

    hotrod351 Member

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    Sep 30, 2006
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    i figure you should be able to put air pressure to the switch off the jeep and see if it closes the connection. kind of a pain to rig up a hose that will slip over the switch and then over the air nozzle but youll know then.
     
  9. May 27, 2010
    pilebuck

    pilebuck Member

    western WA.
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    Apr 28, 2008
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    Ok will see if new switch is bad from nappa.2 will bleed brakes again new master the pedal is firm put all new brakes master bleed lines but u guys are the pros and all feedback is a plus.like i said i put power to one side and test light to other and pressed brakes and no go but if i go from post to poast i have brake lights not pushing pedal thanks people.
     
  10. May 27, 2010
    1970CJ6

    1970CJ6 new mexico air

    rio rancho, new...
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    Nov 29, 2005
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    630
    When you have the switch off check the the threaded hole goes all the way into the master cylinder.

    Had one that was not drill all the way so no pressure would get to the switch.
    I have less hair because of this.
    Andrew
     
  11. May 27, 2010
    tcfeet

    tcfeet Member

    east of west,...
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    May 30, 2009
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    A simple period at the end of sentence would help.
    It would not be like working a puzzle.
    Probaly a faulty brake light switch..:)
     
  12. May 27, 2010
    pilebuck

    pilebuck Member

    western WA.
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    Rodger.Will see if new switch is bad.
     
  13. May 27, 2010
    bkd

    bkd Moderator Supreme Staff Member

    K-Town Tenn.
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    :beer:....on both counts
    Jim
     
  14. May 28, 2010
    BajaEdition

    BajaEdition cj6 owner

    Riverside CA
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    I just replaced 2 of those switches
    in my 67, first one didi not work so I got another and it turned on and off at will, sometimes with noone in the Jeep, si I sourced an AMERICAN MADE one and decided that I like Chineese Junk Less Every Day.
     
  15. May 28, 2010
    mortten

    mortten I can’t put my finger on it 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Peninsula, Ohio
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    I just had one where I had power to the switch and when I pressed the brakes it lit the test light but it wouldn't light the brake lights but if I jumped the switch they would light. Checked everything and scratched my head a lot on it. Over the weekend I swapped in a D-30. When I bleed the brakes the stop lights started working. I figure I had a little bubble of air in there that wasn't allowing the switch to have full contact. It would light a test light but not the stop lights. Voltage drop with a poor connection. My brakes felt fine also.
     
  16. May 28, 2010
    pilebuck

    pilebuck Member

    western WA.
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    Some more food for thought i will bleed brakes again did it last yr never drove it yet.going in and re check the brake switch thank you mortten.
     
  17. May 28, 2010
    pilebuck

    pilebuck Member

    western WA.
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    Apr 28, 2008
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    Well i have brake lights now.It was a bad switch thanx for all the help now to move on ez-wire done :v6::D
     
  18. May 28, 2010
    bkd

    bkd Moderator Supreme Staff Member

    K-Town Tenn.
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    sweet :beer:.....
    Jim
     
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