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Brake Warning Light

Guest Riggs

By Guest Riggs
in 1999-2013 Silverado 1500 & Sierra 1500

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Guest Riggs

Guest Riggs

Posted
Posted

well ive had this brake warning light for the past 3 days, first day i checked all of the fuses, bulbs, parking brake.......

 

it ONLY comes on after 35 mph, i could drive all day at 30 mph but as soon as i get to 35 and faster the light comes on and stays on untill i turn the truck off. but then will do the same thing after i get over 35mph.

 

I have a gm-1 connector and the only shops around here want to charge me over 100 dollars to scan it.. i have no idea what this could possibly be. and when i have the warning light on, if i put the parking brake on it ges brighter and when i release the parking brake it gets duller........

 

 

(btw i drove to work the day it started without a problem and when i went to lunch and pulled out of the driveway it all of the sudden came on....)

sbodi4d Enthusiast

sbodi4d

Posted
Posted

Just a thought, could be an ABS sensor got dirty and is not reading properly. I don't know if you have ABS or not though. On my 1998 Dodge there was a sensor in the rear diff. that went out and caused the brake light to come on and stay on, after I replaced the sensor it went away.

Guest Riggs

Guest Riggs

Posted
Posted

well, i was just working with the rear diff, but i was looking on lmc truck for sensors and couldnt find a replacment for anything really.....

i dont know if i have a sensor like that on this old of truck i dont see any wires going to it :D + idk if dodges are the same as chevy with that stuff, usually when one has it they all do...

alaska511 Senior Enthusiast

alaska511

Posted
Posted
well, i was just working with the rear diff, but i was looking on lmc truck for sensors and couldnt find a replacment for anything really.....

i dont know if i have a sensor like that on this old of truck i dont see any wires going to it :D + idk if dodges are the same as chevy with that stuff, usually when one has it they all do...

 

 

yours has rear ABS, there should be a tone ring right next to the ring gear in the diff housing. Let me do some checking

Guest Riggs

Guest Riggs

Posted
Posted

well, i just replaced the diff cover, i had it sandblasted/painted, and filled it up with valvoline 80/90, 2 quarts. but i am really confused because i drove it around for about 2 days after i did that and i got no warning lights.

 

Alaska please let me know what you find out

 

Thanks guys for the help so far!!

alaska511 Senior Enthusiast

alaska511

Posted
Posted
well, i just replaced the diff cover, i had it sandblasted/painted, and filled it up with valvoline 80/90, 2 quarts. but i am really confused because i drove it around for about 2 days after i did that and i got no warning lights.

 

Alaska please let me know what you find out

 

Thanks guys for the help so far!!

 

 

http://www.aa1car.com/library/abs_kelseyhayes_rwal.htm

 

check this out

Guest Riggs

Guest Riggs

Posted
Posted

alright ill check back 2 marro

 

it says that when the light comes on if it gets brigther with parking brake then its not that... and to test the abs i unplug the box and if it stays on thats the problem so i will check that on my lunch hour 2 marro..... then ill check the senors and go from there i guess.

 

thanks for your help alaska!!!!!!!!!!!!

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