1. Prior to replacement of the combination valve, note the identification code on the valve. It is necessary to have the proper code when replacing the valve.



2. Remove the combination valve electrical connector.
3. Remove the front and rear brake pipes.
4. Remove three allen bolts (11) securing combination valve (12) to the BPMV.
5. Remove the combination valve (12) from the BPMV.
6. Remove two transfer tubes (13).

Important: Do not reuse the transfer tubes. Always install new transfer tubes with a new combination valve.

1. Install two new transfer tubes (13) into the combination valve until fully seated.
2. Install combination valve (12) to BPMV.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

3. Install three combination valve bolts (11).

Tighten
Tighten bolts first to 8 N·m (6 lb ft), then to 16 N·m (12 lb ft).

4. Front and rear brake pipes to combination valve.

Tighten
Tighten brake pipe fittings to 24 N·m (18 lb ft).

5. Connect combination valve electrical connector.

Important: Verify that the combination valve metering rod is depressed during bleeding.

6. Bleed the brake system. Refer to Hydraulic Brake System Bleeding .