[turtlecool]

I have a 1987 bronco witch the break lights not work. They rarely turn on very very briefly when the breaks are pressed down. I’m sure it’s a wiring thing. Looking at the pedal I find 2 things I have no clue about.

Any information to these 2 items would be great.

otherwise, If there is any known common problem with break light malfunction let me know

 

[rpeters549]

One of them is the actual brake light switch. I forget what the other one is - switch for getting it out of park?
Anyway, the switch is easy to remove/replace for testing or if you just want to throw the part at it it isn't expensive. Check to see if it's adjusted correctly. You should hear it 'click' (brake lights now on) with a small movement of the brake pedal.
Have you checked the fuse? Have to checked/cleaned the bulb bases and housings?

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[packagerjr]

The wiring is your brake light switch. Unsure of the other, was thinking cruise control.

You can check for 12V at one harness lead to ensure you have voltage at the switch. You can check switch for continuity to make sure it’s passing current when closed. You can also buy a new one as they aren’t expensive, just a pain to work on due to location.

Also would he wise to ensure your grounds are up to snuff. My 80 grounds its taillight assemblies through the body.

 

[rpeters549]

I think the cruise cancel is part of the light circuit? I could easily be wrong though.

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[slimpartywagon]

Blue cirlcltis for the cruise control (it deactivates the vacuum servo) and the red circle is the brake light switch.

 

[N2 Bronco's]

take the wires from the red brake light switch and short them together to see if the lights stay on or do the same thing. If they stay on you know the brake light switch is the problem if not dig a little deeper to find the culprit. Most likely it's that switch.

EDIT: then again the switch might turn the brakes on when it is open so unplug the switch and see if it turns the brake lights on and if not then stick a wire in the plug to jumper it and close the circuit to see what it does.

 

[turtlecool]

Fixed my break lights by replacing the switch. Still looking to see what the blue circle is. Any ideas guys?

 

[rla2005]

Still looking to see what the blue circle is. Any ideas guys?

Vacuum dump valve for the speed control system.

 

[slimpartywagon]

Fixed my break lights by replacing the switch. Still looking to see what the blue circle is. Any ideas guys?

Blue cirlcltis for the cruise control (it deactivates the vacuum servo) and the red circle is the brake light switch.