Larry
Bigassgas Explorer
That is the Height Sensing Proportioning Valve. Its purpose is to make you pull your hair out after a suspension lift. Actually, the idea behind it was to regulate rear brake fluid based on load (rear suspension height). The best way to handle that on a lifted Sub is to remove it. You can take the main brake line from the frame to the HSPV unscrew it and screw it straight into the rubber brake line on your axle (the hose on the bracket near the fuel tank) then just remove the valve. That is what most people with old lifted Burbs do, including me. I gave up trying to adjust it for the lift.
The valve would not cause your pedal to be spongy. You must still have air in the lines somewhere or issues with the brake cylinders in your new axle. Any fluid leaking out of the brake drums?
The valve would not cause your pedal to be spongy. You must still have air in the lines somewhere or issues with the brake cylinders in your new axle. Any fluid leaking out of the brake drums?