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Sand the rear brake shoes when they get greasy. Replace the
greasy linings or keep them in clean gasoline for 20–30 min and
grind them with sand paper or a wire brush.
After the drums are removed, make sure that wheel cylinders
do not leek and are securely xed to the shield. Pay attention
to the condition and installation of wheel cylinders safety caps
3 (Fig. 9.22), the degree wear of the friction linings and to the
condition of the brake drum.
Safety caps must be tightly installed in piston and cylinder
seats and not damaged.
If the drum working surface has deep notches and burrs or
wear unevenly, rebore the drums from the central orice. The
maximum permissible diameter of the working rebored brake
drum is 281 mm.
Fig. 9.23. Rear wheel brake (variation 2):
a — anchor stud marks; 1 — anchor studs; 2 — shield; 3 — orices for visual inspection
of brake linings; 4 — wheel brake cylinder; 5 — bypass valve; 6,12 — brake shoes;
7 — safety cap; 8 — piston; 9 — O-rings; 10 — snap ring; 11 — release spring.
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