REAR BRAKE LINES AND PROPORTIONING VALVE REPLACEMENT AND
This task covers:
c. Valve Adjustment
Rear of truck raised, frame supported by
jack stands (if removing or adjusting
One proportioning valve adjustment
proportioning valve, all except M1009).
Plug all openings and connections immediately after disconnection to
prevent contamination of brake system.
Use suitable container to catch brake fluid.
If removing brake lines from M1009, perform steps 1 and 3 through 6.
If removing brake lines from all except M1009, perform steps 1, 2, 4, 5,
7, and 8.
If removing proportioning valve (7), perform steps 2 and 8 through 10.
If removing proportioning valve lever (8), perform steps 9 and 11.
Disconnect fitting (1) from brake pipe (2). Remove 3 screws (4) and clips (3).
Remove screw (11) and clip (10). Disconnect brake pipe (2) from proportioning valve (7) and
remove. Inspect fittings for damage and replace as required.
Remove retainer (31). Disconnect brake pipe (2) from hose (30) and remove. Inspect fittings
for damage and replace as required.
Bend clip (24) and remove right brake pipe (25) from hose (9 or 30) fitting. Disconnect right
brake pipe from wheel cylinder fitting (23) and remove. Inspect fittings for damage and replace
Repeat step 4 for left brake pipe as required.
Remove screw (29) and hose (30). Remove bolt (33) and bracket (32) from differential (22)
Remove screw (26) and disconnect hose (9) from proportioning valve lever (8).
Disconnect hose (9) from pipe (5) and remove. Loosen pipe fitting, remove retainer (6), and
disconnect pipe from proportioning valve (7).