UAZ HUNTER 315195, Operating Manual

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Replace the linings in case of their excessive wear (the rivets
are sunk less than 0.5 mm).
When replacing worn shoes or liners, move the piston with
the thrust ring deep into the cylinder for free mounting on the
drum to the shoes. After reassembly, push the brake pedal 2-3
times to install the pistols into the working position.
Do not press the brake pedal when the brake drum or the
leading shoes are removed, as the compressed fluid will press the
pistons out of the wheel cylinders and the fluid will escape.
During each drum removal, grind the lip on the edge of the
friction surface, which appears from drum wear, to ease the next
removals of the drum.
Tighten the bolts of brake shields when the hubs are removed.
Proportioning valve (fig.9.36). During maintenance, check
the function of the proportioning valve. Clean it from the dirt
and check the safety of its fastening. Visually inspect that the
proportioning valve and its parts have no damage, there is no
leakage of the brake fluid and no backlashes in the pillar coupling
with the resilient lever and the real axle bracket.
Fig. 9.36. Proportioning valve:
1 — protective boot; 2 — snap ring; 3 — bushing; 4 — piston O-ring;
5, 7 — piston spring supporting washer; 6 — piston spring; 8 — weatherstrip;
9 — housing bushing; 10 — collar; 11 — lock; 12 — lock spacer; 13 — bypass
valve; 14 — cap; 15 — plug; 16 — housing; 17 — piston
Rear circuit input
Front circuit input
Rear circuit output