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Old 02-13-2018, 05:23 PM   #1
61_FL_Apache
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97 Tahoe dash brake light

Over the last few months, my brake light on the dash comes on when braking. You can feel it in the pedal when it comes on and goes off on the next pump of the brakes.

The brake fluid is fine, no leaks and the brakes work as well as usual.

If its quiet in the truck you can hear a click kinda sound when the light goes off. So it sounds like its right at the pedal inside.

Any ideas?
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Old 02-14-2018, 12:32 PM   #2
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Re: 97 Tahoe dash brake light

It has memory.
Read the trouble code.
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Old 02-14-2018, 02:42 PM   #3
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Re: 97 Tahoe dash brake light

Is it the yellow light or the red light?

If it's the yellow light, scan for abs codes.

If it's the red light, you have a hydraulic problem.
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Old 02-14-2018, 04:20 PM   #4
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Re: 97 Tahoe dash brake light

My scanner will not pull ABS codes, but I can try it..

Its the red brake light on the dash. Same if you had the E brake on.
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Old 02-14-2018, 05:03 PM   #5
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Re: 97 Tahoe dash brake light

Here is a video I made on the way home.

https://youtu.be/SI7bX6mr_0k
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Old 02-25-2018, 12:09 PM   #6
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Re: 97 Tahoe dash brake light

Anymore tips on this issue?
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Old 02-25-2018, 02:09 PM   #7
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Could be several things

My suggestion is to isolate the brake pressure warning switch and go from there.

On the bottom of the EBCM (says Kelsey Hayes on it) facing the master cylinder is a connector. It's below the top row of 3 brake lines and between the 2 lower lines. Disconnect that and do the same things you been doing to get the light to come on.

See if the light won't come on.

Let us know what happens
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Old 02-25-2018, 03:08 PM   #8
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Re: 97 Tahoe dash brake light

Since you hear it inside the cab I'm wondering if it could be physical problem with the switch hanging off the brake pedal pivot itself.
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Old 02-25-2018, 04:02 PM   #9
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Re: 97 Tahoe dash brake light

Quote:
Originally Posted by speedygonzales View Post
My suggestion is to isolate the brake pressure warning switch and go from there.

On the bottom of the EBCM (says Kelsey Hayes on it) facing the master cylinder is a connector. It's below the top row of 3 brake lines and between the 2 lower lines. Disconnect that and do the same things you been doing to get the light to come on.

See if the light won't come on.

Let us know what happens
Speedy: I unplugged that connector and took another test ride. I could still feel this issue in the pedal, but the light did not come on.


Quote:
Originally Posted by Mr_Rich View Post
Since you hear it inside the cab I'm wondering if it could be physical problem with the switch hanging off the brake pedal pivot itself.
Mr Rich: I tried to look above the column where the switch probably is. Its hard to reach and see. There is a brace/bracket on either side if the column that makes it hard to get to.

The sound it make sounds like a spring twanging but not very loud and you can feel in in the pedal at the same time.
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Old 02-26-2018, 11:27 AM   #10
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A spring sound "toing" is the anti-lock brakes activating

The spring sound you hear is the antilock brakes activating. That accounts for why you feel it in the pedal. We could assume the antilock activation is lowering pressure causing the light to come on. However, I don't think normal operation of the antilock system would light the brake light so my thinking here is the antilock is occurring but it doesn't know it's occurring so it then lights the low pressure signal.

At this point you should have someone with a scanner that can read ABS codes check it out. If need be they can ride along to see real time data.

Again I'm thinking there will be no DTC's and you have a Brake Pressure Modulator Valve problem. But stranger things have happened and checking codes is the correct next step.


Good luck.
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Old 03-04-2018, 10:49 AM   #11
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Re: 97 Tahoe dash brake light

I have not had a chance to get scanned for ABS codes yet, but I did take a video of the noise I hear when I press the peddle when the light goes off.

https://youtu.be/ELdabySrwAE Turn up your speakers. This is more for audio then video.
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Old 05-01-2018, 01:15 PM   #12
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Re: 97 Tahoe dash brake light

Been 2 months. Any update?
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Old 05-01-2018, 07:28 PM   #13
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Re: 97 Tahoe dash brake light

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Originally Posted by speedygonzales View Post
Been 2 months. Any update?
Thanks for checking in.. I have not had my truck scanned yet. I have some control arm bushings coming this week. So that's on the front burner.
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Old 06-15-2018, 09:06 AM   #14
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Ummm

http://67-72chevytrucks.com/vboard/s...d.php?t=763790
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Old 06-16-2018, 03:08 PM   #15
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Re: 97 Tahoe dash brake light

Nothing yet. I will reply with a solution.
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