i recently aquired a 1989 comanche 4x4 4.0 auto. ive been fixing misc issues and now i have a brake leak. i believe it is where the metal line comes through the driver front fender. the previous owner lifted it and moved the brake lines now it looks like that line is rubbing on the metal. does anyone have a brake routing diagram. i am just curious where all the lines go and if i can simplify the system any to get rid of more places that a leak might occur. thanks

 

If you don't get an answer here try www.comancheclub.com

Too bad my Comanche is at my buddies shop or I would go out and take a pic for you.

 

The routing is exactly the same as a similar yeared XJ.

 

On my 89 the brake lines run straight down from the master cylinder to the inside of the frame. Then run all along the inside of the frame to the rear tires.

 

Yup, same on my 89

 

one thing that i am confused on is my driver side front line comes straight from the regulator below the master cylinder but the passenger side seems like it comes from the back axle. there is some kind of assembly at the back that has multiple lines criss crossing. i dont get it a guy at work has an 89 xj and his back is just a simple one line into a tee then out. ill take pictures in the day light tommorow to help clarify my wtf situation

 

MJ's have a valve for the rear brake that the XJ's don't. Its to controll the rear brake pressure depending on the load you have in the bed. If it's original it should also have a rod connected to the rear axle at the diff cover.

 

its original but the rods not there so should i find a rod at the junkyard, leave it it, or re run it to eliminate that system

 

My rod was connected wrong and when I put it back in the correct Location the valve worked properly. I would probably hook it up and see what happens. Is the arm still on the valve? If so you can make a new rod from a piece of threaded rod and a couple of ball joints. If it works I would leave it alone and fix the leak. Also try comancheclub.com you can post a want ad and someone on there will probably have what you need.