Brake Proportioning/Combination Valve: Service and Repair

Proportioning Valve

REMOVAL





1. Pull up parking brake lever, and block the tires.
2. Remove brake pipe from proportioning valve at four places.
3. Remove proportioning valve from its bracket.

CAUTION: Do not disassemble or adjust the proportioning valve. (The proportioning valve must be replaced as an assembly.)

INSTALLATION
1. Install proportioning valve to bracket.
2. Connect brake pipes correctly to proportioning valve.
3. Bleed air, then check each joint of brake pipe for oil leaks.
Tightening torque:
Proportioning valve to brake pipe flare nut: 15 Nm (1.5 kgf-cm, 10.8 ft. lbs.)
Proportioning valve to bracket: 18 Nm (1.8 kgf-cm, 13.0 ft. lbs.)