Without Antilock Brakes

GENERAL INFORMATION

Fig 35 Type 3 Proportioning Valve Identification:

CAUTION: Proportioning valves should never be disassembled.

There are two proportioning valve assemblies used in each vehicle. Due to different thread sizes, each proportioning valve has a different part number. During any service procedures identify the proportioning valve assemblies by supplier part number and or the color identification band.

If premature rear wheel skid occurs on hard brake application, it could be an indication that a malfunction has occurred with one of the proportioning valves.

Non-ABS Proportioning Valve Locations On Master Cylinder:

One proportioning valve controls the right rear brake, and the other proportioning valve controls the left rear brake. Therefore, a road test to determine which rear brake slides first is essential.

If a malfunctioning proportioning valve is suspected on a vehicle. Refer to Testing and Inspection for the required test procedure.

REMOVE
Use the proportioning valve test procedure stated above to determine which proportioning valve requires replacement, then replace it using procedure below.
1. Disconnect brake tube from proportioning valve requiring removal from the master cylinder.
2. Remove proportioning valve from the master cylinder requiring replacement.

INSTALL
1. Wet O-ring seal on new proportioning valve using clean fresh brake fluid.
2. Install proportioning valve in master cylinder and hand tighten until proportioning valve and O-ring seal is fully seated in master cylinder. Torque proportioning valve to 40 Nm (30 ft. lbs.).
3. Install brake tube on proportioning valve. Tighten tube nut to 17 Nm (145 inch lbs.) torque.
4. Bleed the affected brake line.