Brake Warning Light - JeepForum.com
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post #1 of 9 Old 06-19-2017, 03:03 PM Thread Starter
WmGardner
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Brake Warning Light

Brake warning light came on in my TJ yesterday. Have not been driving it much for the past couple of months. Yesterday I pulled it out, installed the Tuffy under seat box, and then started to park it again when I saw the light staying on. I moved the parking brake lever a few times, setting it, releasing it, etc. The Jeep seems to roll OK, at least for the couple of feet I tried to push it.....

So, the parking brake (obviously) will make the light/alarm activate. What else trips this light/alarm? Low pressure? (Peddle felt OK but didn't want to head out on road 'till I was more sure) Bad booster? Low fluid?

Thanks, in advance, guys.


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post #2 of 9 Old 06-19-2017, 03:05 PM
biffgnar
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I thought light came on when system felt imbalance between front and rear fluid system and that directly the mechanical parking brake shouldn't affect it. Now I suppose the parking locking up the rear does change the pressure felt in the rest of the system.
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post #3 of 9 Old 06-19-2017, 03:11 PM
tworley
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I know some people have fixed it by mashing the pedal to the floor a couple times. Mine came on after an axle swap, I pulled the combo valve (maybe proportioning valve?) and worked the plunger back and forth, that solved my warning light.

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post #4 of 9 Old 06-19-2017, 03:15 PM Thread Starter
WmGardner
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Brake Warning Light

Quote:
Originally Posted by tworley View Post
I know some people have fixed it by mashing the pedal to the floor a couple times. Mine came on after an axle swap, I pulled the combo valve (maybe proportioning valve?) and worked the plunger back and forth, that solved my warning light.


What?????

Honey...... The guys say I need new axles to make this problem go away......


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-'06 LJ (daily driver)

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post #5 of 9 Old 06-19-2017, 03:15 PM
TJ4Jim
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I would start by checking the fluid level in the master cylinder and if it's low look around the rear brake drums for a leaky cylinder and inspect the brake line hoses.
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post #6 of 9 Old 06-19-2017, 03:18 PM Thread Starter
WmGardner
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Quote:
Originally Posted by TJ4Jim View Post
I would start by checking the fluid level in the master cylinder and if it's low look around the rear brake drums for a leaky cylinder and inspect the brake line hoses.


Yeah, that is where I plan to start. It was raining like hell at the time. I was frustrated enough to be rolling it by hand, I wasn't going to stand there and let rain run down my back as I was checking fluid.

Hopefully this is all it is, low fluid and an easy leak.


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-'01 TJ ("play" Jeep)
-'06 LJ (daily driver)

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post #7 of 9 Old 06-19-2017, 05:07 PM
2jhanna
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If the fluid is low, it may not be a leak. Could be over worn pads/shoes, causing calipers/wheel cylinders to be full of fluid.

jhanna
denton county, tx
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post #8 of 9 Old 06-20-2017, 10:40 AM
NotURMailman
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Things that will turn on that light:
parking brake on
fluid in master cylinder low
high pressure differential between front and rear brake circuits
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post #9 of 9 Old 06-21-2017, 01:57 AM
Jonny Jeep
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There's no low brake fluid sensor on TJs.

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