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Cruise control release switch

Discussion in 'Electrical & Audio' started by Daniel Michael, Jan 17, 2019.

  1. Daniel Michael

    Daniel Michael Junior Member

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    Daniel
    Truck Year:
    1990
    Truck Model:
    R2500 suburban
    Engine Size:
    5.7
    Hello all,

    This is my first post - been a long time follower though. I have a 1990 suburban with the 5.7 and the th400. The cruise control suddenly stopped working completely the other day.

    I replaced the stalk switch because it looked worn out anyways and was the easiest/cheapest to replace. But no luck.

    I don't think the servo would suddenly stop working altogether - though I could be wrong. I've verified that there is vacuum in the reservoir and the check valve works.

    When looking around under the dash, I noticed that there are two brake pedal activated switches. Are the brake light and cruise control switches separate? Would functioning brake lights mean that the switch is working? Is there a chance that the switch is stuck open releasing all the vacuum?

    Thanks for any help.
     
  2. Charlie

    Charlie Full Access Member

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    :welcome:
     
  3. Big Chip

    Big Chip Full Access Member

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    Not sure about your’s but my 79 has a bad release switch and any little bump in the road will rattle the switch and turn the cruise off. Mine are separate switches if I recall correctly.
     
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  4. yevgenievich

    yevgenievich Full Access Member

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    There are separate switches. One with vacuum hose is for cruise
     
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  5. Daniel Michael

    Daniel Michael Junior Member

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    Thanks for the replies!

    Does anyone happen to know the part number the cruise switch is? The only thing I can find is the stoplight w/ cruise switch. Is it just two of these? One for brakes and one for the cruise?


    [​IMG]

    Thanks again.
     
  6. Daniel Michael

    Daniel Michael Junior Member

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    Looks like my picture didn't load - I pasted a picture of part. STANDARD MOTOR PRODUCTS SLS153. There are two types that look similar - one for cruise and one without. I might just pull them out to get a better look but don't see how the vacuum hose connects to the switch.
     
  7. chengny

    chengny Full Access Member

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    Description of operation, diagnostic procedures and wiring diagram:

    ST_350_90_1990_Chevrolet_R_V_G_P_Truck_Models_Wiring_Manual 124.jpg

    ST_350_90_1990_Chevrolet_R_V_G_P_Truck_Models_Wiring_Manual 125.jpg

    ST_350_90_1990_Chevrolet_R_V_G_P_Truck_Models_Wiring_Manual 126.jpg
     
  8. Daniel Michael

    Daniel Michael Junior Member

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    Hello again, its been awhile since I've had time to work at this problem but I'm at it again. Since my last post I pulled the switch, realized I purchased the wrong switch, and realized that they don't make the switch I need anymore. Has anyone gone through looking for the 156000278 cruise switch?

    I've seen several interchangeable part numbers listed but none seem readily available. i guess Ill just wait until one comes up on ebay unless someone has a secret source for these.
     
  9. Daniel Michael

    Daniel Michael Junior Member

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    The only result I get on ebay is a wall mounted peacock taxidermy which is actually pretty cool. If it weren't two grand I would probably just get that and not worry about cruise control...
     
  10. K201979

    K201979 Full Access Member

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    Lol. Hopefully someone can help.
     
  11. yevgenievich

    yevgenievich Full Access Member

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    I have been trying to keep a stash of them because they were impossible to find last time I looked. Not sure how many I have at this point, but can start searching if no other sources come up. Maybe lmc or brothers truck have it and I just never found it.
     
  12. Rusty Nail

    Rusty Nail Whatever! Supporting Member

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    What's cruise control?
     
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  13. 78C10BigTen

    78C10BigTen Full Access Member

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    How well you hold your foot at highway speed..... at least in my truck
     
  14. Red Rex

    Red Rex Junior Member

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    Had that issue in my 84 model. Turns out it was bad grounds. Test the switch you are thinking about replacing for continuity. Be sure all your grounds including the battery posts and cable are clean and tight
     
  15. Boone83K10

    Boone83K10 Full Access Member

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    Here is what you need. Part # S749 BWD Cruise Switch at Advance Auto. 22 bucks

    If yours is the different style (the longer version) then you need the Borg Warner S749 version. It's 49 bucks on Amazon.

    You can click on those and it will take you to the link.
     
    Last edited: Aug 22, 2019
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