Without Antilock Brakes

Proportioning Valves For Non-ABS Vehicles:

TESTING
1. After road testing vehicle to determine which rear wheel exhibits premature rear wheel skid, to determine which proportioning valve needs to be tested.
2. Remove hydraulic brake line from proportioning valve controlling the rear wheel of the vehicle which has premature wheel skid.
3. Then remove the proportioning valve from the rear brake line.

CAUTION: Be sure the pressure test fitting being installed into proportioning valve, has the correct thread sizes for installation into the proportioning valve and installation of brake tube fitting.

4. Install Pressure Test Fitting, Special Tool 6805-1 or 6805-2, or equivalents on rear brake tube which the proportioning valve was removed from.
5. Install proportioning valve into pressure test fitting installed on rear brake tube.

CAUTION: Be sure the pressure test fitting being installed into proportioning valve, has the correct thread sizes for installation into the proportioning valve and installation of brake tube fitting.

6. Install Pressure Test Fitting, Special Tool 6805-3 or 6805-4, or equivalents into outlet of the proportioning valve.
7. Connect brake hydraulic line onto pressure test fitting installed in proportioning valve
8. Install a Pressure Gauge, Special Tool C-400 7-A, or equivalent into each pressure test fitting. Bleed air out of hose from pressure test fitting to pressure gauge, at pressure gauge to remove all trapped air. hose.
9. With the aid of a helper, apply pressure to the brake pedal until reading on proportioning valve inlet gauge, is at the pressure shown on the following chart. Then check the pressure reading on the proportioning valve outlet gauge. If proportioning valve outlet pressure does not agree with value shown on the following chart, when inlet pressure shown on chart is obtained, replace the proportioning valve. If proportioning valve is within pressure specifications do not replace proportioning valve.
10. Check rear wheel brake shoe linings for contamination or for replacement brake shoes not meeting OEM brake lining material specifications. These conditions can also be a possible cause for a premature rear wheel skid.
11. Install proportioning valve in rear brake line and hand tighten both tube nuts until they are fully seated in proportioning valve.
12. Tighten both brake line tube nuts at the proportioning valve to a torque of 17 Nm (145 in-lbs.).
13. Bleed the affected brake line.