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Brakes
BRAKE ADJUSTMENT
WARNING
Adjusting the brakes by means of the brake cables
could cause a hard brake pedal with little or no
braking power. This could cause loss of control of
the vehicle resulting in severe bodily injury and /or
property damage.
Service Brake
Mechanical and Hydraulic Brakes
The mechanical and hydraulic brake assemblies are
identical except for hydraulic fittings. The adjustment
procedure is the same for both the mechanical and
hydraulic brakes.
Note: The brake adjustment is inside of the left
and right brake. Do not adjust the brake
by means of the brake cables as this will
cause mis-operation of the brakes. If you
hear a single "clunking" noise while braking
it may be due to mis-adjustment of the
brake cables or linkage. Refer to Replace
Brake Linkages/Cables for information
regarding proper adjustment of the cables
and linkages.
1: Raise the wheel off of the ground and support
with jack stands.
2: Release the park brake.
3: Remove the tire/wheel assembly.
Note: Refer to Tires and Wheels section for
information on removing the wheel.
4: Align the adjusting access slot in the brake drum
with the adjusting star wheel at the bottom of the
brake.
5: While rotating the brake drum back and forth,
rotate the brake adjuster star wheel until the
brake is tight enough so that brake drum cannot
be rotated.
6: Back off the star wheel just enough so that the
brake drum rotates freely.
7: Install the tire/wheel assembly.
8: Repeat this procedure for the opposite side
brake.
9: Set the park brake.
10: Reconnect the main positive and negative cables
at the batteries.
11: Remove blocks from behind the wheels.
12: Release the park brake and test drive the vehicle.
Page 58
Adjust the Service Brake Linkage
Do not use this procedure to adjust the brakes. This
procedure should only be performed when replacing
any of the mechanical brake linkages or cables or it is
found that the cables or linkages have been adjusted
incorrectly.
1: Release the park brake.
2: Loosen the clevis jam nuts on the main brake
cable and connecting rod.
3: Loosen the brake cable and connecting rod.
4: Adjust the park brake linkage so that the angle
between the connecting rod and the cross shaft
tab is at 60 degrees.
Brake linkage with protractor in place
at 60 degrees
5: Tighten the brake cable so that all slack is
removed from the cable, but not so much so that
the cross shaft rotates.
6: Tighten the connecting rod so that all slack is
removed from the brake cables, but not so much
as to actuate the brakes.
7: Tighten the jam nuts on the brake cable,
connecting rod, and park brake linkage.
8: Set the park brake.
9: Reconnect the main positive and negative cables
at the batteries.
10: Remove blocks from behind the wheels.
11: Release the park brake and test drive the vehicle.
Parking Brake, Mechanical Brakes
Trucks equipped with mechanical drum brakes do not
have a separate adjustment for the parking brake. If
the parking brake requires adjustment, then the entire
brake system is in need of adjustment. Refer to
section for information regarding
the Service Brake
adjusting the brakes.
B0-150-00 and MX-016-00
Adjust
MB-150-03
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