Brake Proportioning/Combination Valve: Adjustments

1. Note: Make sure that the fuel tank is at least 3/4 full.

Raise the vehicle on a suitable lift so that the vehicle is at curb height and wheels are on a flat surface.





2. Note: Do not change the position of the upper nut on the valve operating rod.

Loosen the valve adjuster sleeve set screw.
3. Cut a piece of 3/8-inch OD x 1/4-inch ID rubber vacuum hose 16.3 mm (0.65 inch) in length and slice it lengthwise.





4. Install the hose on the valve operating rod.





5. Note: Make sure that the valve adjuster sleeve is sliding freely and is resting on the lower mounting bracket.

Tighten the valve adjuster sleeve set screw.
6. Lower the vehicle.