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Unread 10-23-2012, 01:33 PM   #1
snell22team
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2008 JK Wrangler 
 
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Location: mount gilead, ohio
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"Brake" light always on

On 2008 jeep jk unlimited my brake lights comes on after about 5 seconds after starting my engine and doesn't blink or dings just stats solid tell I shut engine off

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Unread 10-23-2012, 02:22 PM   #2
KingtheZJ
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not sure now its setup on a JK, but on my jeep there is a switch under the dash that the brake pedal hits when it is not depressed at all. i'd start there.
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Unread 10-23-2012, 06:46 PM   #3
LoveHate
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May be ebrake switch or abs as well.
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Unread 10-29-2012, 06:44 AM   #4
snell22team
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Yeah i should of said on the dash, the letters "Brake" illuminates on my instrument panel after about 5 seconds when the light comes on a ding noise chimes once at the same time and the light will stay on for my entire drive no matter how long. I checked my fluid and thats good my clutch slave was leaking so i thought that was the proble because it would cause a pressure change in brake fluid resevoir but nothing yet.
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Unread 10-29-2012, 07:56 AM   #5
Pitbull330
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Quote:
Originally Posted by snell22team
On 2008 jeep jk unlimited my brake lights comes on after about 5 seconds after starting my engine and doesn't blink or dings just stats solid tell I shut engine off
Check to see if ur brake level sensor is stuck. Take a screw driver a gently move around the bobber. Also if ur e-brake cable is broken the light will come on. Check that to
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Unread 10-30-2012, 07:18 AM   #6
mdm
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2000 TJ Wrangler 
 
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Location: Elkmont, AL
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This is from the 2011 Owner's Manual:

11. Brake Warning Light
This light monitors various brake functions,
including brake fluid level and parking brake
application. If the brake light turns on, it may
indicate that the parking brake is applied, that
the brake fluid level is low, or that there is a problem with
the anti-lock brake system reservoir.
If the light remains on when the parking brake has been
disengaged, and the fluid level is at the full mark on the
master cylinder reservoir, it indicates a possible brake
hydraulic system malfunction or that a problem with the
Brake Booster has been detected by the Anti-Lock Brake
System (ABS) / Electronic Stability Program (ESP) system.
In this case, the light will remain on until the
condition has been corrected. If the problem is related to
the brake booster, the ABS pump will run when applying
the brake and a brake pedal pulsation may be felt during
each stop.
The dual brake system provides a reserve braking capacity
in the event of a failure to a portion of the hydraulic
system. A leak in either half of the dual brake system is
indicated by the BrakeWarning Light, which will turn on
when the brake fluid level in the master cylinder has
dropped below a specified level.
The light will remain on until the cause is corrected.
NOTE:
The light may flash momentarily during sharp
cornering maneuvers, which change fluid level conditions.
The vehicle should have service performed, and
the brake fluid level checked.

If brake failure is indicated, immediate repair is necessary
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Unread 10-30-2012, 05:41 PM   #7
Pitbull330
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Is the ABS light on. R u having any false ABS activation?
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Unread 10-31-2012, 07:36 AM   #8
snell22team
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Well the abs light is not on just the "Brake" lights on my dash but like if i was getting off the freeway on an exit ramp the ESP kicks in and causes the brakes to be braking to try and recover my slipping but i am no even slipping i am on dry pavement idk what this has to do with it but it just doesn't seem right to me
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Unread 10-31-2012, 07:43 AM   #9
snell22team
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If the ESP is the ABS then yes having false avtivation during turning
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Unread 10-31-2012, 12:03 PM   #10
chevy2169
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Did you put different wheels and larger tires on your jk?
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Unread 10-31-2012, 04:50 PM   #11
snell22team
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Quote:
Originally Posted by chevy2169
Did you put different wheels and larger tires on your jk?
Yes put 35 inch wheeld
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Unread 10-31-2012, 05:05 PM   #12
Pitbull330
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Quote:
Originally Posted by snell22team

Yes put 35 inch wheeld
Did u have ur bcm recalibrated. U need to have ur vehicle scanned for codes. Then get back to me. I cannot perform further diagnostics without seeing the vehicle if I had it in my possession I guarantee it would be fixed.
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Unread 10-31-2012, 05:11 PM   #13
Pitbull330
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Fyi.... ur brake light is tied into your ABS. But it doesn't mean you have a problem with the ABS. When your ESP is activating and you're having false activation of the ABS is it at lower speeds...
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Unread 10-31-2012, 10:13 PM   #14
chevy2169
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Pitbull pretty much nailed it, that's exactly where I was going with the tire size question. You need your body control module recalibrated because of the different wheel/tire size. Basically your wheel speed sensors, if they're still there, are going crazy and assume that you have stock size tires still. The larger tire is causing the bcm to use the esp and abs when it isn't needed.
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Unread 11-01-2012, 06:08 AM   #15
snell22team
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It happens at about 20-30 mph the ESP kicks on the code I get is c1008 so we checked the sensor and nothing was wrong now without recalibrating will that cause the brake light to be on and how do I recalibrate
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