71
If one of the hydraulic brake circuits is a failure, the warning
lamp on the instrument panel lights up.
Periodically remove the brake drums and clean the brake
parts of dirt. Periodicity of this operation depends on service
conditions of the automobile. In the summer season and when
driving on mud-covered roads, carry out cleaning more fre-
quently.
Check the pressure regulator* for serviceability during
seasonal maintenance. Clean the pressure regulator of dirt and
check it for proper fastening. Visually make sure that the
regulator and the parts of its drive are not faulty, and also make
sure that there is no leakage of brake fluid and there are no
backlashes between the post complete with resilient lever and
the bracket of the rear axle.
When pressing the brake pedal, the regulator piston should
be extended from the regulator body by 1.7 - 2.3 mm. No piston
stroke and also its deficient or excessive stroke indicate that the
regulator or its drive is damaged.
When maintening the hydraulic steering system, pay atten-
tion to the stopper 17 (Fig. 68) and check, if there is no leakage
of brake fluid from under it. The plug in its service condition
must be flushed with the opening of the regulator body against
the stop. If the stopper is extended above the opening, and brake
fluid leaks, repair or replace the regulator.
In the service period, when replacing the rear springs, adjust
force of the toggle 5 (Fig. 69) on the regulator piston. Carry out
the adjustment in the following sequence:
1.Place the automobile ready for driving on a level ground.
2. Loosen the lock nut of the adjusting bolt and back out the
bolt through 2-3 of a turn.
3. Screw the bolt 4 until it touches the regulator piston 1
(Fig. 68), draw the bolt tight through 2/3 of a turn (4 bolt flats)
and tighten the lock nut.
4. Check the regulator piston stroke (see above).
5. With the automobile in motion, check the adjustment for
correctness. To this end, brake the automobile until locking the
wheels, when driving on a straight level dry asphalt road. When
the regulator is serviceable and the adjustment of the drive is
* Installed on some automobiles
