Brake Proportioning/Combination Valve: Service and Repair

Proportioning Valve

REMOVAL
1) Remove brake pipe from proportioning valve at four places.
2) Remove proportioning valve from its bracket. 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
13 - 18 Nm (1.3 - 1.8 kg-m, 9 - 13 ft-lb)
Proportioning valve to bracket
20.1 - 18.9 Nm (2.05-2.95 kg-m, 14.8 - 21.3 ft-lb)