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#1
10-26-2010, 04:01 PM
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91 Suburban dash brake light on
Greets, as the title implies. Before the light came on the truck had a propensity to lock up the back wheels, other than that it seemed to work fine. The light stays on dimmer than when the e-brake is applied. Brake fluid level seems fine.
I am trying to narrow down what could be the culprit- master cyl, proportioning valve, ???? I am selling this truck and don't want to put a lot of money out but I want to fix it first. Thanks in advance!! 
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#2
10-26-2010, 04:07 PM
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Re: 91 Suburban dash brake light on
On the prop valve there is an eclectrcal connector with one wire in it: Unplug the connector and see if the red "BRAKE" indicator on the dash goes out. Post your results.
__________________
You have to know how it works, to figure out why it doesn't.
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#3
10-27-2010, 03:46 PM
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Re: 91 Suburban dash brake light on
Quote:
thanks for your help!
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#4
10-27-2010, 04:22 PM
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Re: 91 Suburban dash brake light on
Two brake lines leave the master cylinder and go to the proportioning valve. It is usually close to the master cylinder and has 2 lines that go to the front wheels and one that goes to the rear wheels. When you unplug the wire, if the light stays on, the problem is the parking brake is not released, or the park brake switch is stuck. You can confirm that by unplugging the switch on the park brake mechanism.
__________________
You have to know how it works, to figure out why it doesn't.
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#5
10-28-2010, 05:05 PM
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Re: 91 Suburban dash brake light on
Quote:
I doubted it was the ebrake switch because when that is engaged the light is brighter. I unplugged it anyways and the light stays on dimly. Here is a photo of what I think is the proportioning valve attached to the master cylinder. I unplugged the wire going to it and the light stays lit. I guess I need to pull the rear drums and see whats going on.
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#6
10-28-2010, 06:29 PM
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Re: 91 Suburban dash brake light on
Yes, that is the proportioning valve. If it stays lit when both the prop valve and park brake are unplugged at the same time, there might be a problem in the daytime running light circuit, (the DRL's use the same tan with white trace wire). Check the fuses and DRL bulbs and grounds.
__________________
You have to know how it works, to figure out why it doesn't.
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#7
10-28-2010, 07:19 PM
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Re: 91 Suburban dash brake light on
Quote:
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#8
10-28-2010, 07:23 PM
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Re: 91 Suburban dash brake light on
If the light stays on with both the park brake switch and prop valve unplugged, the brakes are not causing the light to come on. Those are the only two things in the brake system that can turn the light on.
__________________
You have to know how it works, to figure out why it doesn't.
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#9
10-29-2010, 12:33 PM
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Re: 91 Suburban dash brake light on
Quote:
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#10
10-29-2010, 02:50 PM
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Re: 91 Suburban dash brake light on
Bingo! Most likely a poor ground or short circuit in the cluster itself or the wiring that goes to it. Make sure the connector that plugs into the instrument cluster is plugged in tightly. It's kind of a cheesy set up and can vibrate loose over time. Check all fuses, both terminals, with a voltmeter or test light.
__________________
You have to know how it works, to figure out why it doesn't.
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#11
10-29-2010, 07:03 PM
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Re: 91 Suburban dash brake light on
Not real sure if your '91 has rear ABS. If it does and the speedo quit, you may want to look at the VSS (Vehicle Speed Sensor).
__________________
57 Chevy 210 65 Olds 442 Convertible (Another one sold) 75 GMC Vandura 3/4 Ton 1999 K2500 Old Body Style Suburban (Gone but not forgotten) 05 Dodge Ram 3500/5.9 Cummins 2012 Toyota FJ Cruiser
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