Brake proportioning valve

[MummifiedCircuitry]

Has anyone adjusted or inspected their rear brake proportioning valve before? I was checking mine today as I was under the montero and the lever arm doesn't move at all, even if I pry on it with a bar. Is it probably seized up or is it normal to have no movement? I can't see how the spring would have enough leverage to move it. Part is circled in red.

 

[Salonika]

Thanks......now I’m thinking about mine again......many years ago I tried sourcing a new one and never found one. I never did understand exactly how it works, I thought that as the truck squats more under increased weight, it shifts breaking power to the rear......I think. Anyway keep us posted. I’d buy a new one tomorrow if you figure out where they’re sold. My guess is yours is seized. Mine probably is also.

 

[MummifiedCircuitry]

Or if anyone has found a good way to remove/delete the part?

 

[Michael Brown]

I would think that if it is a full mechanical device, it could be replaced by a manual proportioning valve.
They are used in race cars to adjust front/rear or left/right brake bias.
https://www.jegs.com/i/JEGS/555/630...0J3k5PvcEzIDeWbKfuOEmX1jpzM-wGVUaAhf3EALw_wcB

You would have to turn the knob to adjust it for current weight load, but I don't see why it wouldn't work.