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OT mechanics - my running lights work but brake lights don't

Posted on 3/25/16 at 6:49 pm
Posted by jlu03
San Diego
Member since Jul 2012
3362 posts
Posted on 3/25/16 at 6:49 pm
Jeep Grand Cherokee.

All bulbs are working but brake lights do not light up when braking. What is the problem??
Posted by Godfather1
What WAS St George, Louisiana
Member since Oct 2006
89834 posts
Posted on 3/25/16 at 6:51 pm to
Check the fuse. Running lights and brake lights likely run on different circuits.
Posted by AndyCBR
Baton Rouge, LA
Member since Nov 2012
8331 posts
Posted on 3/25/16 at 6:57 pm to
Check the brake light switch. Many are famous for disintegrating over time, either plastic or rubber bumpers that actuate the switch at the pedal arm.



Posted by CaptainBrannigan
Good Ole Rocky Top Tennessee
Member since Jan 2010
21644 posts
Posted on 3/25/16 at 6:59 pm to
quote:

Check the brake light switch


This.
Posted by papasmurf1269
Hells Pass
Member since Apr 2005
21468 posts
Posted on 3/25/16 at 7:20 pm to
If the brake switch is gone out, the break lights will stay on.
Posted by wickowick
Head of Island
Member since Dec 2006
46423 posts
Posted on 3/25/16 at 7:21 pm to
You check the break fluid?
Posted by jlu03
San Diego
Member since Jul 2012
3362 posts
Posted on 3/25/16 at 7:29 pm to
About to check brake switch. Thanks for responses.
Posted by fightin tigers
Downtown Prairieville
Member since Mar 2008
79824 posts
Posted on 3/25/16 at 7:31 pm to
Did you check the bulbs as well? Could be a rare coincidence that the filaments went out on only the brake lights.

Assuming it is a dual filament bulb or even seperate bulbs.
Posted by s14suspense
Baton Rouge
Member since Mar 2007
16156 posts
Posted on 3/25/16 at 7:43 pm to
Thank you for trying to get that fixed. So many people riding around BR with broke arse brake lights.
Posted by AndyCBR
Baton Rouge, LA
Member since Nov 2012
8331 posts
Posted on 3/25/16 at 7:47 pm to
quote:

If the brake switch is gone out, the break lights will stay on.



Not always true. Depends on whether the cars switch is normally closed or open.

It varies by manufacturer/make of vehicle.
This post was edited on 3/25/16 at 7:48 pm
Posted by Front9Bandit
Member since Dec 2013
15432 posts
Posted on 3/25/16 at 7:52 pm to
quote:

Check the brake light switch. Many are famous for disintegrating over time, either plastic or rubber bumpers that actuate the switch at the pedal arm.


First step
Posted by ruzil
WNC
Member since Feb 2012
18465 posts
Posted on 3/25/16 at 7:52 pm to
Sets you up for lawsuit money. Go for it.
Posted by kilo1234
Member since May 2014
1431 posts
Posted on 3/25/16 at 8:30 pm to
Your brake tag is expired?
Posted by idlewatcher
Planet Arium
Member since Jan 2012
98740 posts
Posted on 3/25/16 at 8:41 pm to
I have an X5 and had to extract both lights due to oxidation. Soldered the holes and they both are working. Could be the same issue as what you have. I'll try and find you the link

@2:19 mark
This post was edited on 3/25/16 at 8:43 pm
Posted by LSUTigersVCURams
Member since Jul 2014
21940 posts
Posted on 3/25/16 at 9:42 pm to
quote:

Jeep Grand Cherokee. 


I found your problem.
Posted by potent357
Prairieville
Member since Jan 2010
4272 posts
Posted on 3/25/16 at 10:25 pm to
What year model is it? If is it an older model the Grand Cherokee is notorious for this. You need to replace the little sockets that the bulbs go in. It is a piss poor design.
Posted by jlu03
San Diego
Member since Jul 2012
3362 posts
Posted on 3/26/16 at 11:25 am to
The problem is fixed. There was a large amount of corrosion on the fuse. Once it was cleaned everything worked. Thanks for the responses
Posted by onelochevy
Slidell, LA
Member since Jan 2011
18377 posts
Posted on 3/26/16 at 11:30 am to
is your brake tag expired?
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