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BRAKES
with each other before applying pressure to the units. If
2. Unscrew tile nuts retaining the wheel and with )
tire is pressed on over the closed end of the drum, it will
soft-faced hammer rap the wheel to loosen the tapered
be loose and work off the drum during operation.
dowels. (Fig. 3) Remove the dowels.
4. Remove the two shoe retaining caps and
springs and brake return springs. (Fig. 5) Use clamp or
wrap wire around both ends of the wheel cylinder to
keep wheel cylinder pistons in place.
Figure 3.
3. Pull the wheel from the truck. (Fig. 4) Inspect
the surface of the drum for badly worn areas, and, if
resurfacing is necessary, this should be performed
before assembly.
Figure 5.
C. CLEANING AND INSPECTION
1. Use solvent to clean all metal parts, except the
brake shoe assemblies. The shoe rib and table can be
wiped with solvent dampened cloth. No solvent should
get on the lining. Since solvent may not readily remove
brake fluid residue, use denatured alcohol for this
purpose.
2. The wheel cylinder should be overhauled
whenever brake linings are replaced.  Refer to the
Wheel Cylinder Section.
3. Examine drums for cracks, heat checks, and
deep grooves. The drums should not be bell-mouthed
Figure 4.
or barrel-shaped nor should the mounting holes be
elongated. If any of these exist, the drums should be
NOTE: The old tire can be pressed from the wheel and
replaced. Glaze on drums, otherwise in good
used on a new hub, or a new tire can be pressed onto
the old hub. The drum has a slight taper near the open
end to facilitate tire replacement, Place the tire on the
tapered end making sure the tire and drum are square
B -130

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