Page K-15
Repair and Service Manual
B
B
MECHANICAL BRAKES
Read all of Section B and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
Repeat the previous step(s) until the pedal free travel
does not change during the aggressive braking.
Check to see that the clevis pins attaching the brake
cables to the brake levers are loose (Ref. Fig. 19 on
Page K-15). If they are not loose, inspect system again
and correct as required. If the clevis pins are loose,
tighten jam nut to 10 - 11 ft. lbs. (14 - 15 Nm) at the
spherical nut.
Fig. 19 Check Clevis Pins
The parking brake latching force can be checked as ver-
ification after setting brake pedal free travel. To check
parking brake latching force, place a ‘bathroom’ scale on
the service and parking brake pedals. Using both feet
press the scale down against the parking brake pedal
until it latches. The parking brake should latch between
65 and 75 lbs. (29 - 34 kg) indicated on the scale (Ref.
Fig. 20 on Page K-15).
Perform the Periodic Brake Performance Test as
described and return the vehicle to service if brake per-
formance is satisfactory.
Fig. 20 Checking Parking Brake Latching Pressure
Brake Drum Removal and Installation
Remove the dust cap (1) to gain access to the castel-
lated nut (2) and the cotter pin (3) (Ref. Fig. 21 on Page
K-15).
Fig. 21 Brake Assembly
Remove the cotter pin (3) and castellated nut as shown.
Do not apply the brake when removing the nut as the shoes
may not fully retract preventing removal of the brake drum.
Remove washer (4).
Slide the brake drum (5) from the axle shaft. If required,
tap the drum with a plastic faced hammer to loosen it
from the axle shaft or use drum puller (P/N 15947-G1).
Use care when raising the adjuster arm. Too much force
will damage the adjuster and require that both wheel
brake assemblies be replaced.
If the drum does not slide from the brake assembly, the
brake shoes must be retracted. Rotate the hub so that
the hole in the drum is in the six o’clock position which is
directly over the brake mechanism. Use a small straight
blade screwdriver to raise the adjuster arm
just above
the star wheel.
Loosen the star wheel to retract the brake shoes and
remove the brake drum.
Clevis Pin Loose?
If required adjust spherical nut
to achieve correct parking brake
latching pressure of 65 - 75 lbs.
(29 - 34 kg).
Loosen Jam Nut
Use a 'bathroom' scale
to confirm the latching force
required to engage and latch
the parking brake.
65 70 75
Front of Vehicle
3
5
1
2
4
6
NOTICE
