Removal of air from the hydraulic actuator
1. Clean the tank and bleeder from dust and dirt.
2. Check the fluid level in the hydraulic drive reservoir and add fluid if necessary.
3. Put on the head of the fitting 9 (see fig. Slave cylinder and clutch release fork) working cylinder hose and immerse its lower end in a vessel with hydraulic fluid (30–50 g).
4. Press the clutch pedal sharply 3–5 times at intervals of 2–3 s between pressings and, holding the pedal depressed, unscrew fitting 9 by 1/2–3/4 turn, by pressing the pedal, the liquid in the system, together with air, is forced out through hose to vessel.
5. After the clutch pedal reaches the extreme forward position and the outflow of fluid through the hose stops, tighten the fitting until it stops.
6. Repeat these operations until the bubbles are completely out of the hose.
7. While holding the clutch pedal depressed, tighten the fitting until it stops and remove the hose, put the cap on the fitting, after wiping it dry.
When pumping, monitor the fluid level in the hydraulic drive reservoir. It should be above the opening of the tube connecting the reservoir to the clutch master cylinder. The end of the bleed hose must be permanently immersed in liquid.
After pumping, bring the fluid level in the tank to the lower edge of the filler neck.
If, despite prolonged pumping, air bubbles come out of the hose, check the tightness of the fastening of the connections, find out if there are any cracks or leaks on the tubes in the connections with the fittings. It is possible for air to enter through damaged O-rings in the master or slave cylinders.