WHEELS, TIRES AND BRAKES
end of the "USABLE RANGE" mark
c. Make sure the brake return springs and
shoes are securely seated (Figure 71).
d. Adjust the rear brake light switch: see
Rear Brake Light Switch
1. Examine the brake linings for oil or grease
contamination. Contaminated linings must be
2. Measure the thickness of the lining at its
thinnest part (Figure 72). Replace both shoes
when any portion of the lining is worn down to
0.1 in. (2.5 mm).
3. Use vernier calipers and check brake drums
for excessive wear (Figure 73). Standard brake
drum diameter is 180 mm. If the drum is worn
to a diameter more than 180.75 mm the wheel
hub must be replaced for safety.
4. Check the brake shoe return spring free
length (Figure 74). If the springs are stretched
and weak, they won't fully retract the shoes
from the drum, resulting in a power-robbing
drag on the drums and rapid wear of the lining.
Replace the springs if they are longer than the
limit given in Table 2.
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