Lada Niva 4x4, Service Manual

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Bleeding the clutch hydraulic system
Air in the clutch hydraulic system is indicated by incomplete
clutch release, and also by "sponginess" and "failure" of clutch
pedal.
To expel air from the hydraulic drive:
- clean the tank and the bleeder from dust and dirt;
- check the liquid level in the hydraulic system tank and top
up if necessary;
- put a hose on bleeder 9 (see fig. 3-3) of the slave cylinder
and place its lower end into a container with hydrodrive liquid (30-
50 gr);
- undo bleeder 9 by 1/2-3/4 turn, several times rapidly
depress and smoothly release the pedal until there will be no air
bubbles coming out from the hose;
- depress the pedal and fully tighten the bleeder. Remove the
hose and refit the bleeder cap.
If, despite a continuos bleeding, there are still air bubbles in
the hose, check the tightness of connections, find out if there are
cracks on tubes or leaks in places of connections. Air inleak is
possible through damaged sealing rings of the master or slave
cylinders.
During bleeding:
- the liquid level in the reservoir should be higher than the
opening of the tube connecting the reservoir with the master
cylinder;
- the end of the bleeding hose should be always dipped in liquid;
- after bleeding, top-up liquid in the reservoir to the lower
edge of the filler neck.
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Fig. 3-2. Clutch pedal and master cylinder:
1 - pedal cluster mounting bracket; 2 - clip; 3 - clutch pedal servo spring; 4 - clutch pedal return spring; 5 - clutch pedal limiter bolt; 6 - clutch pedal; 7 - pushrod;
8 - protective cap; 9 - circlip; 10 - pushrod piston; 11 - sealing ring; 12 - master cylinder piston; 13 - inlet port; 14 - sealing ring (ring valve); 15 - piston bypass orifice;
16 - cylinder cavity; 17 - piston return spring; 18 - gasket; 19 - plug; 20 - master cylinder body; 21 - bypass (compensation) port; 22 - gasket; 23 - union; 24 - washer