Thanks All for the advise....
I will check for fluid leaks at the wheels since I do not see a leak around the differential valve. If this does not help I will drive and see if I can center the valve by a quick jab on the brakes. If both do not clear the light I will try to follow the procedure noted.
I'm not 100% clear on the instruction below so is the Brake Tube Nut the Nut Plug at one end of the differential valve?
Dennis
** There is a 4 step process to correct this, shop manual states "to centralize the pressure differential valve and turn off the warning light
1) Turn the ignition switch to the ACC or ON position. Lossen the differential valve assembly brake tube nut at the outlet port on the opposite side of the brake system that was bled last. Depress the brake pedal slowly to build line pressure until the pressure differential valve is moved to a centralized poition and the brake warning light goes out; then, immediately tighten the oulet port tube nut to the specified torque ***
2) Check the fluid level in the master cylinder reserviors and fill them to within 1/4 inch of the top with the specified brake fluid, if neccessary
3) Turn the ignition switch to the OFF position
4) Before driving the vehicle, check the operation of the brakes and be sure that a firm pedal is obtained