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Rear Brake Actuator?

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I am in the process of converting a 89 MJ Eliminator with a slew of late model XJ parts. I am going to put a dual diaphragm brake booster on with the master cylinder.

I noticed that on the front of the MJ proportioning valve there is a line which connects to a tee with the rear brake line then runs to some kid of actuator with a bracket that supports it from the differential.

I was wondering what is it and what does it do.

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My understanding is it adjusts brake bias more to the rear according to how much load is on the rear of the truck. When you push down on the back of the truck, a little lever on the dff cover presses it up, letting it know you need more stopping power in the rear when you otherwise wouldn't. As to what it's called I have no idea.

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