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It is not recommended to change the brake drums between the
hubs as working surfaces of the drums will wobble more.
Air gap between the shoes and the drum is restored automati-
cally as the linings wear.
Replace the linings in case of their excessive wear (the rivets
are sunk less than 0.5 mm).
If the linings are glued, replace worn brake shoes if the linings
wear to a thickness of less than 1.5 mm.
Move the pistons with the snap rings deep into the cylinder to
put the drum on the shoes easily when replacing the worn shoes
or linings. When replacing the shoes and linings in brakes (Varia-
tion 1) raise adjusting lever 6 (Fig. 9.22). To make reassembly
more convenient, x the lever on the shoe: match the orice in
the upper part of the lever with orice A (Fig. 9.22) in the shoe
rib and insert a bar into these orices with a diameter of 6–8 mm.
When reassembly comes to an end, remove the bar. After the
reassembly press the brake pedal 2–3 times to install the pistons
to the working position.
Do not press the brake pedal when the brake drum or the
leading shoes are removed as the compressed uid will press
the pistons out of the wheel cylinders and the uid will escape.
During every drum removal grind the lip on the edge of the
friction surface which appears from the drum wear to ease the next
removals of the drum.
Tighten the brake shield bolts when the hubs are removed.
Proportioning valve. The motor vehicles without ABS are
equipped with the proportioning valve (Fig. 9.24), which ensures
the optimal distribution of braking forces between the axles of
motor vehicle and prevent the rear wheels from blocking earlier
than the front wheels. When servicing the motor vehicle check
the proportioning valve and clean it from dirt and check its
attachment. Make sure by visual inspection that the valve and its
drive details are not damaged, the brake uid does not leak and
the coupling of the pillar with the exible arm and the bracket
on the rear axle has no play.
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