Vaz 21213, Руководство по ремонту, Страница: 127 / 222

Check and repair. At hard pedal movement examine the
working surfaces of pedals, bushes and shaft.
If there will be small risks or traces of oxidation on surfaces of
metal parts, grind them slightly with sandpaper; renew worn outer
plastic bushes on pedals.
Check the spring tension. The length of the brake pedal
spring should be: under load of 12.8±1.96 N (1.3±0.2 kgf) - 80
mm, under load of 117.5±5.88 N (12±0.6 kgf) - 160 mm.
The clutch pedal return spring has the length of 130 mm
under load of 36.26-30.38 N (3.7 – 3.1 kgf), and 155 mm under
load of 49.49 – 42.63 N (5.05 – 4.35 kgf). Length of the clutch
servo unit spring under load of 219.52 – 180.32 N (22.4 – 18.4
kgf) should be 120 mm, and under load of 645.82 – 529.22 N
(65.9 – 53.9 kgf) - 152 mm.
Servo unit
Removal and refitting.
When removing the servo unit, do
not disconnect the brake hydrodrive master cylinder from the
hydraulic system to avoid air penetration.
The order of removal:
- disconnect the servo unit push rod from the pedal;
- undo the nuts fastening the master cylinder to the unit,
remove it from pins and move aside;
- disconnect the hose from the servo unit;
- undo the nuts fastening the servo unit bracket to the body
front and remove the unit in assembly with the bracket.
Refitting of the servo unit is carried out in reverse order.
Master cylinder
The design of the master cylinder is shown on fig. 6-9.
Removal and refitting. Disconnect the flexible hoses from
the master cylinder and close the openings of hoses and con-
nectors on the cylinder to prevent liquid leak from reservoir and
penetration of dust, dirt or foreign matters.
Undo the tube nuts and disconnect from the master cylinder
the steel pipelines that are carrying liquid to wheel cylinders of
front and rear brakes.
Remove the cylinder, having undone the nuts that are fas-
tening it to the servo unit.
Refitting of the master cylinder is carried out in reverse
sequence. After refitting the cylinder, bleed the hydraulic system
to expel air.
Dismantle and reassembly . Remove connectors 2 (fig. 6-
10) with connecting bushes 3, turn out lock bolts 5 and take out
all components in order specified on fig. 6-10.
The reassembly of the cylinder is carried out in reverse
sequence. Grease all components with brake liquid. When
reassembling, use tool 67.7853.9543.
127
Fig. 6-10. Master cylinder components:
1 - cylinder body; 2 - connector; 3 - connector bush; 4 - sealing washer; 5 - lock bolt; 6, 9 - sealing rings; 7 - rear brake / front additional drive piston; 8 - distance ring;
10 - sealing ring holding spring; 11 - spring cup; 12 - piston return spring; 13 - washer; 14 - front brake drive piston