MJRemi Posted May 21, 2011 Share Posted May 21, 2011 I noticed my brake lights were intermittent the other night when i was backing into my driveway. They came on/off as I applied constant pressure. Now they don't come on at all. My hazards work fine and all my fuses are OK. I cleaned the contacts on the brake pedal switch but no effect. Bad switch? Loose wire? Bulbs and connectors would prevent hazards from working, right? Link to comment Share on other sites More sharing options...
jimoshel Posted May 21, 2011 Share Posted May 21, 2011 First thing I would check would be the brake switch. Make sure it hasn't worked loose or is broken. Link to comment Share on other sites More sharing options...
MJRemi Posted May 21, 2011 Author Share Posted May 21, 2011 First thing I would check would be the brake switch. Make sure it hasn't worked loose or is broken. It didn't appear to be either and I cleaned the contact prongs. I just finished checking and cleaning every tail light connector and all seems OK. I will try swapping the pedal switch out for one I have on the bench from a 86. If that doesn't do it then I'm baffled because all the other lighting functions work. Link to comment Share on other sites More sharing options...
Akula69 Posted May 21, 2011 Share Posted May 21, 2011 My experience was very similar...all the brake functions worked but the brake lights would not. I went through all the steps and found that the culprit was the push rod on the booster. I had done the brake booster upgrade several months ago and ground the rod down to allow the use of the old brake light switch. It worked fine until just a few weeks ago when I noted they were not coming on. As I studied the switch, I noticed it had shifted up slightly on the pushrod, and the contact plate was no longer able to release. When I rotated it back down slightly it immediately worked again. I could not find a way to resolve the issue, so I switched to the 93 - up brake switch. Link to comment Share on other sites More sharing options...
MJRemi Posted May 21, 2011 Author Share Posted May 21, 2011 I'm swapping my booster for a ZJ booster in about 4 weeks. Looking at it, I don't understand how the ZJ rod can function exactly like the MJ rod, even if cut flat. The MJ rod is a bit lower on the pedal. I'm going to cut the two rods and weld the MJ rod onto the ZJ booster so I don't change any angles or heights. Link to comment Share on other sites More sharing options...
Boots Posted May 21, 2011 Share Posted May 21, 2011 Mine did something similar to that, I cleaned all the plugs and it still wouldn't work, so I gave up. A couple days later I was looking at it again and one of the wires going into the plug under the very back corner of the bed was just a little bit loose. I jammed it back in really good and they have worked fine since. Link to comment Share on other sites More sharing options...
MJRemi Posted May 22, 2011 Author Share Posted May 22, 2011 Well, I couldn't get the original switch off. The nut just started rounding off so I cleaned the switch in place and wiggled it around a little to re-align. The brake lights come on but only with a fair amount of pressure. A light touch to the pedal will not activate the brake lights so I will swap out the switch when I install the ZJ booster. ( hacksaw the switch bolt ) Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now