Vaz 21213 Repair Manual page 133

Fig. 6-21. Checking the rear brake wheel cylinders:
1 - piston rests; 2 - cylinder under check; 3 - cylinder bracket; 4 - low pressure
manometer; 5 - high pressure manometer; 6 - cylinder for building up pressure;
7 - reservoir; 8 - flywheel
Remove the regulator and disconnect the arm. Plug all open-
ings of the pressure regulator and pipelines.
Refitting of the pressure regulator is carried out in reverse
sequence. Before tightening the regulator fastening bolt place
tool 67.7820.9519 (see fig. 6-6) on the end of the regulator arm.
Direct the tool bar upwards to the car body. Thus, the distance of
(150+5) mm (see "Pressure regulator position adjustment")
between the end of arm 2 and underframe side member is
obtained.
Raise protective cap 3 (see fig. 6-22) and by turning the reg-
ulator on the fastening bolts, obtain a slight contact between the
arm end and the regulator piston.
Fix the regulator in this position, fully tighten the fastening
bolts, then apply a layer of greasing Ñí-1 or "Ñàíéê" on shaft 2
and the protruding part of the piston. Refit rubber cap 3 having
applied 5-6 gr of the same greasing.
Remove tool 67.7820.9519 and reconnect the arm end to tie-
rod 7, previously having covered the bushes of the rod-to-arm
connection with greasing Ñí-1 or Ñàíéê.
Attach the gas release system pipelines to the car body.
Bleed the brakes to expel air from the rear brakes.
Dismantle and reassembly. Use key A.56124 to turn out the
plug, remove lining 5 (fig. 6-23), take out piston 10, distance
sleeve 2, sealing 7, plate 8, spring 9 and thrust washer with seal-
ing ring 3.
When reassembling, which is carried out in reverse
sequence, grease all components with brake liquid.
ATTENTION. To differentiate the VAZ-2121 and -21213
pressure regulators from others of similar design, there is a
groove on the bottom part of the piston.
Wash the components with isopropyl alcohol or brake liquid
and inspect. The components surfaces should have no marks
and roughness.
Check the spring tension, length in free condition should be
17.8 mm, and under load of 76.44 - 64.68 N (7.8-6.6 kgf) - 9 mm.
Renew damaged components, sealings and sealing rings.
Fig. 6-23. Rear brake pressure regulator, non-operating position:
A - normal pressure chamber; B - adjustable pressure chamber; P - force from
arm 4; 1 - regulator housing; 2 - distance sleeve; 3 - sealing ring; 4 - regulator
control arm; 5 - gasket; 6 - plug; 7 - seal; 8 - spring cup; 9 - piston spring;
10 - piston
Fig. 6-22. Pressure regulator linkage components:
1 - pressure regulator; 2 - regulator control arm shaft; 3 - cap; 4 - lock plate;
5 - bolt with spring washer; 6 - rear axle beam; 7 - pressure regulator control
arm-to-rear axle bracket connecting tie-rod; 8 - bolt washer; 9 - plastic bush;
10 - distance sleeve; 11 - tie-rod securing bolt; 12 - pressure regulator control
arm; 13 - arm thrust bush; 14 - bush bracket; 15 - washer; 16 - spring washer;
17 - nut; 18 - bush clamp; 19 - clamp-to-bracket fastening bolt
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