brake valve ?

[whalebus]

I have a 89 mj and am changing the rear end out to some thing bigger and was wondering if that strange valve that the brake lines go to over the axle was the proportioning valve.I allways thought it was closer to the MC than in the rear,but this thing has it mounted with this cheesy little rod and I just don't know what the hell its for.somebody school me.Thanks

[mvusse]

It's a height sensing variable proportioning valve. The more weight in the back, the lower the truck will sit, the higher the arm is pushed up and the more brake power is provided to the rear wheels. There's also a safety feature in the front distribution block that will bypass that valve if there's no pressure in the front brake system to provide full brake power to the rear wheels.

 

It's a pretty ingenious design, and a great idea as long as it works correctly. But because of problems with lifts, old age and other causes, a lot of people are taking it out or bypassing it.

[whalebus]

thanks.I new that the rod had to do some thing and that makes perfect since.when you remove it do you cap off 1 line or the other since there is 2 going to the front?

[Eagle]

Ideally, you remove one line and cap the outlet at the front metering block. It has been written up several times.

[maddzz1]

All the info you need. With pics

 

http://www.comancheclub.com/forums/view ... ning+valve

[whalebus]

thanks guys