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Brake Light on Dash

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by sarazk5, Jul 13, 2001.

  1. sarazk5

    sarazk5 1/2 ton status

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    Anyone have this come on? Mine stays on and won't go off. I know i need rear brakes, but I can't figure out why this light is staying on. Any ideas?
     
  2. RaisedK5

    RaisedK5 1/2 ton status

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    Ok thats BAD, the light comes on if there is a problem with the brakeing system, there is a switch in the propotioning valve so that if there is a large pressure difference, front to back, the light comes on, for instance if you lost front or rear brakes, so it would really be in your best interest to check out your brakes, there could be something simple but there could be something potentially deadly wrong with your brakes.

    RaisedK5

    "Of all the things I've lost, I think I miss my mind the most!"
     
  3. 88streetblaze

    88streetblaze 1/2 ton status

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    it will also come on it the proportioning/combination valve trips..
    pop the hood and on the follow the brake lines to it should be on the driver side kind of down underneth the first little cross support inbetween the motor and radiator there is a plug mines a pink wire i belive it will be on top unplug it and see if that turns it off
    if it does then more than likey it thought there was a leak and triped so fix your rear brakes and check for leaks and pump the brakes so it will reset itself..
     
  4. Jonathan

    Jonathan 1/2 ton status

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    The light on my dash used to come on durring heavy braking, but eventually it quit. I was told that it could be the master cylinder.

    77 Blazer, 350, NP203, K&N, 31-inch Cooper Discoverers
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  5. Emmettology 101

    Emmettology 101 3/4 ton status

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    Or it could be a brakelight switch that is out of adjustment!

    <font color=green>MIKE</font color=green> - "Hukd on fawnics,werkd fer me!"
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  6. CaptCrunch

    CaptCrunch 1/2 ton status

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    First thing is do the rear brakes cause that is one reason it could be on... the other could be a leak in the system or leak in the master cylinder... first thing first get the wheels off and look at the brakes... if they need replacement then replace them. Also make sure the wheel cylinders in the rear arent't leaking. Once the brake are good all around, adjusted in the rear, and bled see how it does.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
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  7. 88streetblaze

    88streetblaze 1/2 ton status

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    the brake light in the dash is only turned on by two things the parking brake and the prop valve and there isn't any adjustments to either or those....
     
  8. Emmettology 101

    Emmettology 101 3/4 ton status

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    There is also a switch down behind the brake pedal also! Mine was on and here my bracket was a little fudged up, so I had to move the switch a little. Even went ot Auto Zone and bought a new switch!

    <font color=green>MIKE</font color=green> - "Hukd on fawnics,werkd fer me!"
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  9. 88streetblaze

    88streetblaze 1/2 ton status

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    ok i will conceed(1 e or 2?) that if the braket gets messed up but other than that there shouldn't be any way to adjust that switch
     
  10. Emmettology 101

    Emmettology 101 3/4 ton status

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    The end of the switch that goes towards the pedal arm and has lips on it similar to the threads of a screw, but I dont think they are actual threads. These hold it in place in the bracket and you can move it closer or farther away from the pedal arm.
    That is how I adjusted mine.. Its been a while thoguh and I am not sure which way it moved. I think back(twards the firewall) I actaully didn't moved the bracket, I moved the switch in the bracket.

    <font color=green>MIKE</font color=green> - "Hukd on fawnics,werkd fer me!"
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  11. newyorkin

    newyorkin 1 ton status

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    You can push the button on the prop valve and see it resets, but you're probably best off doing the shoes and checking out the wheel cylinders. A buddy of mine just swapped out 3 of them on his 'burb, and when he finally got a good one it turned out to be the $11 one over the $25 ones... They're cheap and easy to replace (except bleed, which requires two people).
    I had the same problem once when my rear shoes were real worn out and the wheel cylinder was leaking. I almost lost all the rear fluid, but at some point the prop valve cut it off.
    BTW, I agree with raisedK5, you should check this out as soon as you can. K5's are dangerous heavy brutes to lose yer brakes in!

    Check your brake fluid!

    Ratch
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  12. Pugsley

    Pugsley 1/2 ton status

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    Also try giving the parking brake lever a good kick - My 82 C30's brake warning light was frequently on, but it wasn't a hydraulic problem, it was the stupid parking brake lever being just loose enough to trigger the light.

    <font color=red>What would Brian Boitano Do?</font color=red>
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