Columbia ParCar Expediter EX21-24A, Service Manual

Page: 37 / 94

Section 5 - Accelerator & Brake System
2. Remove cotter pin and clevis pin securing brake strips to
brake cross member. Discard cotter pin and e-ring.
3. Repeat for other brake strips.
4. Secure brake strips to rear axle brake actuator arms
(Figure 5-4) with new clevis pins and new cotter pins.
5. Secure brake strips to brake cross member with new
clevis pins and new cotter pins.
6. With vehicle stationary, depress the brake pedal and
check for
1/4” pedal free travel before resistance is felt.
Maximum pedal free travel should not exceed 2”
measured from floor board to top of pedal. If adjustment
is required, see
Mechanical Brake Linkage Adjustment
below.
7. Operate vehicle on level ground, applying brakes to
ensure that both rear brakes apply equally. Check that
excessive force is not required to apply brakes. Excessive
force
required to apply brakes could indicate
malfunctioning brake linkage or excessive wear to brake
shoes.
MECHANICAL BRAKE ADJUSTMENTS
LINKAGE ADJUSTMENT
NOTICE: Correct brake operation should be confirmed
before adjustments are made to cables and mechanical
linkage. Check that corrosion has not caused
excessive resistance in the operation of the brake
cables. If corrosion is present, replace cables before
performing adjustments.
1. Loosen jamnuts on brake rod connecting brake pedal to
equalizer.
2. Rotate brake rod to shorten or lengthen it. Adjust length of
brake rod until free brake pedal movement is less than
1/4”.
3. Tighten jamnuts.
PARKING BRAKE PEDAL ADJUSTMENT
After rear brake operation is tested, and brake linkage and
cables are properly adjusted, check and adjust the parking
brake as follows:
1. Look through the floor opening while gently pressing on
the brake pedal. The gap between the brake ratchet end
and the brake ratchet pawl should be no greater than
1/16”-1/8” (Figure 5-5).
2. If adjustment is required, remove the clevis pin securing
the brake rod to the brake pedal. If the gap between the
parking brake ratchet and the brake pawl is less than
1/16”, shorten the rod slightly to adjust. If the gap is
greater than 1/8”, lengthen the rod to adjust.
3. Reconnect the brake rod to the parking brake pedal.
Recheck the space to verify correct gap.
Figure 5 - 4
Figure 5 - 5