CJ7 Brake light issue - JeepForum.com
 1Likes
  • 1 Post By John Strenk
 
LinkBack Thread Tools
post #1 of 6 Old 02-13-2020, 07:44 PM Thread Starter
rscottdfw
Registered User
1984 CJ7 
 
Join Date: Dec 2019
Posts: 2
CJ7 Brake light issue

I'm new to working on a jeep, so i apologize if this is too easy, but the brake lights don't work on my '84 CJ7. tail lights work. blinkers work. fuse is good. replaced brake light switch (which was a pain!), still nothing. Looking for suggestions how to trace the problem. thanks

rscottdfw is offline  
Sponsored Links
Advertisement
 
post #2 of 6 Old 02-13-2020, 08:13 PM
John Strenk
Moderator
 
John Strenk's Avatar
1976 CJ5 
 
Join Date: Feb 2005
Location: Shalersville Ohio
Posts: 19,902
do your emergency flashers work?
If not it’s a a fuse. The brake light and emergency light share the same fuse.

If that’s ok the you will need a test light.
Check both sides of the plug on the brake light switch on the brake pedal.
One side of the plug should have constant power. The other side will have power when the pedal is pressed down.

If no power on one side check the switch is adjusted properly.
If no power on either side then go back to fuse. Some times the socket gets corroded and not make contact.
If it’s ok then you have a broken wire between the fuse box and switch.

If yo do have power then check to see if the turn signal plug is pushed in all the way.
Check if the power from the brake switch is reaching the turn signal plug.

If there is power then there is a problem with the turn signal switch.
If no power at the turn signal plug then you have a broken wire someplace.

Since the turn signal lights work, there is no need to go further than the ts switch.
pedal2themetai likes this.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


I drive a Prius to save money and buy more Jeep Parts....
John Strenk is offline  
post #3 of 6 Old 02-14-2020, 11:57 AM Thread Starter
rscottdfw
Registered User
1984 CJ7 
 
Join Date: Dec 2019
Posts: 2
thanks....flashers are not working so i'll check fuse box again.
rscottdfw is offline  
 
post #4 of 6 Old 02-15-2020, 12:32 PM
258
Registered User
1985 CJ7 
 
Join Date: May 2013
Location: SP
Posts: 2,169
Would that brake pedal switch cause the light at speedometer to stay on? Everything here functions but that darn light started coming on and won't shut off. I played around with the pedal and its switch and it worked (went off); for only about 3 days. Can't seem to find the issue. MC has fluid too. . . . do I need to bleed brakes again?
258 is offline  
post #5 of 6 Old 02-16-2020, 01:28 AM
John Strenk
Moderator
 
John Strenk's Avatar
1976 CJ5 
 
Join Date: Feb 2005
Location: Shalersville Ohio
Posts: 19,902
Which light is coming on? The brake warning light?

The brake light switch would have nothing to do with the brake warning light coming on.
But as you suspect a problem with the brake system could be causing the problem.
There is a switch in the combination valve below the master cylinder. If there is a leak in one part of the system then there is a piston inside the combination valve that will trip this switch and turn the brake warning light on.

Also the parking brake pedal will also turn on this light so if your brakes feel good, then look at the switch on the parking brake pedal .


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


I drive a Prius to save money and buy more Jeep Parts....
John Strenk is offline  
post #6 of 6 Old 02-16-2020, 04:09 PM
258
Registered User
1985 CJ7 
 
Join Date: May 2013
Location: SP
Posts: 2,169
Quote:
Originally Posted by John Strenk View Post
Which light is coming on? The brake warning light?

The brake light switch would have nothing to do with the brake warning light coming on.
But as you suspect a problem with the brake system could be causing the problem.
There is a switch in the combination valve below the master cylinder. If there is a leak in one part of the system then there is a piston inside the combination valve that will trip this switch and turn the brake warning light on.

Also the parking brake pedal will also turn on this light so if your brakes feel good, then look at the switch on the parking brake pedal .

Yes, the brake warning light inside speedo. The pedal feels good; two clicks down and it's tight. I'll look further into that switch.

I just checked underneath at the combination valve only to find out that it is mounted to the frame with only ONE bolt. Apparently the shop that replaced it (I didn't have the right tools at the time), took a small grinder to the previous CV to remove the 2 mounting bolts. I can see now why they didn't add the second bolt; the tubular Nerf bar is in the way and those are welded on nicely and in direct path of the second bolt. I only wish they had said something instead of me finding this out now. It feels secure however under the speed and road conditions the Jeep endures, I can only image it wiggles and causes air bubbles from it vibrating. Hmm?

Now I need to figure out how to secure that without un-welding the tube bar. PITA!
258 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome