UAZ PATRIOT Operation Manual page 145

Air gap between the shoes and the drum is restored
automatically as the linings wear.
Replace the linings in case of their excessive wear (the rivets
are sunk less than 0.5 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
(Variation 1) raise adjusting lever 6 (Fig. 9.31). To make reassembly
more convenient, fix the lever on the shoe: match the orifice
in the upper part of the lever with orifice A (Fig. 9.31) in the
shoe rib and insert a bar into these orifices 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 fluid will press the
pistons out of the wheel cylinders and the fluid 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.
Rear circuit inlet
1 — protective boot; 2 — snap ring; 3 — bush; 4 — piston O-ring; 5, 7 -piston
spring supporting washer; 6 — piston spring; 8 — weatherstrip; 9 -housing bush;
10 — cuff; 11 — lock; 12 — lock spacer; 13 — bypass valve; 14 — cup; 15 —
plug; 16 — housing; 17 — piston
Rear circuit outlet
Fig. 9.33. Proportioning valve:
145
Front circuit inlet