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Whats this for?

Discussion in 'The Garage' started by sunnyc123abc, Jun 19, 2006.

  1. sunnyc123abc

    sunnyc123abc 1/2 ton status

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    Well, im trying to figure out why my torque converter lock up isn't working. I think its an electrical problem, so i was checking some stuff with my meter, and then i saw this, which i believe is the brake switch for the tcc. But what is the hose comeing out the back of it for?:confused:

    [​IMG]
     
  2. maynardogle

    maynardogle 1/2 ton status

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    Probably dumps the vac motor on the cruise control.
     
  3. sunnyc123abc

    sunnyc123abc 1/2 ton status

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    That could be it. But there are two switches connected to the brake pedal, and I thought the other switch was for the cruise control, and brake lights :confused:
     
  4. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    I don't really know about your year of truck . But in my 83 , I have a switch for the pedal so it unlocks when brakes apply . I also have a vacuum switch on the firewall so the tranny knows when I am cruising .
     
  5. sunnyc123abc

    sunnyc123abc 1/2 ton status

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    its an 84. So do you have two switches right next to each other on top of the brake pedal?
     
  6. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

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    One switch does your brake lights, and cruise control, the other switch does your TCC, and dumps the vac motor as suggested :)
     
  7. p.o.s 78

    p.o.s 78 Registered Member

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    Who would carry the switch, i went to autozone and they couldnt even order it
     
  8. rampage

    rampage 1/2 ton status

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    Did you check here at LMC?
     
  9. badmix

    badmix 1/2 ton status

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    Brake light switch or TCC lockup.

    Can order from ROCK AUTO.com or maybe LMC.com

    When my TC wouldnt lock up, I went thru some steps to diagnose it. First thing was to hook up a lil LED idiot light to the 12v wire going to the trans, this let me know that the electrical was working. I had first worried it was the solenoid in the trans that went bad.

    I ended up replacing the part under the dash that you pointed out, I also replaced the small lil vacuum thingy on the firewall. It has vacuum line in one side and electrical on the otherside. This is what was bad on my truck.

    I just went to rockauto.com. here is the part that is on the firewall that went bad on my truck.

    ACDELCO # 212331
     
  10. Keitha

    Keitha 1/2 ton status Premium Member

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    That is the CC switch and dump. I bought one from a dealer about 1 year ago. $17 if I remember correctly.

    On you TCC, adjust the other switch so that the button is depressed when the brake pedal released.
     

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