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emergency brake light wont go off

Discussion in 'The Garage' started by Guss, Sep 14, 2005.

  1. Guss

    Guss Registered Member

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    any one know how to reset the brake light in a 90 blazer
    replaced the brakes and rotors back not even close to worn.
    but i wore the fron way farther than i sould have now brake light wont go off.
    do i just disconect the battery for a period and if so how long?
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

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    Only two things trigger the brake light: Switch at the brake pedal is messed up, or the proportioning valve has turned it on. OK, three: wiring issue.
     
  3. dremu

    dremu Officious Thread Derailer Premium Member

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    Is it *blinking*, or on steady?

    If it's on steady, you're low on brake fluid or the p-valve (as Dorian points out) thinks you are, the switch on the parking brake is horked, or there's a wiring problem.

    If it's blinking, that's an ABS code and is a whole other ball of wax.

    -- A
     
  4. Leper

    Leper 1/2 ton status

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    unplug the controller near the master cylinder and plug it back in. Fixed 2 trucks this way. Check the fluid level. Flushing the brakes not a bad idea either.
     
  5. JIMs70K25

    JIMs70K25 1/2 ton status

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    Not sure if it's the same but on both my 70s, I had to brake hard to reset the p-valve, and the light went out. Also the wire could be disconnected from the p-valve.
     
  6. Guss

    Guss Registered Member

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    ok its a solid light and i checked the wire on the portioning valve witch
    A. conected tightly
    B. free of corrosion
    but i know my e-brake pedal does work( doesnt lock when applied) ill check the switch there and let you guys know.
     
  7. Guss

    Guss Registered Member

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    got the e-brake to latch now working. light still on and only gets brighter
    when e-brake is pushed. i pulled the release and it stays on but dims
    cheked switch and found no problems
    AAAAAAAHHHHHHH!
     
  8. Rob 85K5

    Rob 85K5 1/2 ton status GMOTM Winner

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    Check your fluid.
     
  9. Guss

    Guss Registered Member

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    fluid is full and pretty clean
     
  10. Guss

    Guss Registered Member

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    what do you mean unplug next to master cylinder? are you talking about
    the sensor?
     
  11. dremu

    dremu Officious Thread Derailer Premium Member

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    1990-91 R and V series trucks (don't ask, but it includes your Blazer, presuming it's a full-size) have rear-wheel anti lock brakes, aka RWAL or ABS.

    There's a black plastic box somewhere around your master cylinder, which is the computer that controls this mess... that's why I asked if it was a BLINKING light, indicating a problem with this system, or a SOLID light, generally indicative of the rest of the (normal) system.

    -- A
     
  12. Guss

    Guss Registered Member

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    ok ill try unplugging i thought it was the ecm :rolleyes: the battry reset wont work for this though?
     
  13. Guss

    Guss Registered Member

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    it worked thanks alot
     
  14. Leper

    Leper 1/2 ton status

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    I was assuming your 90 looked like my 91. There is a controll unit mounted my master cylinder with a couple of large connectors on it.
     
  15. 91BurbDude

    91BurbDude Registered Member

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    I have a 91 Burb with this same problem. I also checked the e brake switch but found the same thing that when the e brake release is pulled the light stays on but not as bright. I will try the unplugging thing tomorrow. I knew if I searched the forums I would find someone with the exact problem I have! LOL
     
  16. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    I had to reach under mine Monday , and hammer the bracket back in place , and tug tje cable a bit to free it , so my pedal would go back up and turn the light out ...... *** **** ROCKS :D
     
  17. Guss

    Guss Registered Member

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    just reset the computer on the master cyl. and it will be fine
     

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