See Figure 1
REMOVAL & INSTALLATION
- Raise the vehicle on a hoist. Disconnect the brake warning lamp wire from the valve assembly switch.
To avoid damaging the brake warning switch wire connector, expand the plastic lugs so that the shell wire connector may be removed from the switch body.
- Disconnect the brake hydraulic lines from the differential valve assembly.
- Remove the screw retaining the pressure differential, metering and proportioning valve assembly to the frame side rail or support bracket and remove the valve assembly.
- Mount the combination brake differential valve assembly on the frame side rail or support bracket and tighten the attaching screw.
- Connect the brake hydraulic system lines to the differential valve assembly and tighten the tube nuts securely.
- Connect the shell wire connector to the brake warning lamp switch. Make sure that the plastic lugs on the connector hold the connector securely to the switch.
- Bleed the brakes and centralize the pressure differential valve.
CENTRALIZING THE PRESSURE DIFFERENTIAL VALVE
After any repair or bleeding of the primary (front brake) or secondary (rear brake) system, the dual brake system warning light will usually remain illuminated due to the pressure differential valve remaining in the offcenter position.
To centralize the pressure differential valve and turn off the warning light after the systems have been bled, follow the procedure below.
- Turn the ignition switch to the ACC or ON position.
- Check the fluid level in the master cylinder reservoirs and fill them to within 1 / 4 inch; (6.35mm) of the top with brake fluid, if necessary.
- Depress the brake pedal and the piston should center itself causing the brake warning light to go out.
- Turn the ignition switch to the OFF position.
- Before driving the vehicle, check the operation of the brakes and be sure that a firm pedal is obtained.