- put on the head of the fitting 1 (figure 90) rubber hose 2 for draining liquid, and lower its free end into a transparent vessel 3, partially filled with liquid;
- sharply pressing the brake pedal 3-5 times at intervals of 2...3 sec, unscrew the nipple by 1/2-1/3 of a turn with the pedal pressed. Continuing to press the pedal, force out the liquid in the system together with the air through the hose into the vessel. After the pedal reaches the forward extreme position and the flow of liquid through the hose stops, screw the air release nipple all the way in. Repeat these operations until air stops coming out of the hose;
- keeping the pedal pressed, tighten the fitting until it stops and remove the hose. Wipe the hose dry and put on the protective cap;
- repeat the operations for the other wheels, first on the second wheel of the same circuit, and then sequentially on both wheels of the other circuit.
Figure 90. Bleeding air from the brake hydraulic drive:
1 - bleed nipple; 2 - hose; 3 - a container with brake fluid.
[The information is posted on the portal www.VAZbook.ru]
When removing air, make sure there is fluid in the tank, not allowing its bottom to become exposed, as this will allow air to enter the system again. If there is no air in the brake drive, the brake pedal should travel about 1/2 of its full travel. To eliminate the influence of the vacuum booster on bleeding the brakes, remove air with the engine not running.
If there is no brake fluid in the hydraulic drive, fill the system as follows:
- loosen the fittings on the cylinders of all wheels by 1.5-2 turns;
- sharply pressing the brake pedal and smoothly releasing it, tighten the fittings after the liquid starts to flow out of them. Then bleed the system.
When removing air from a vehicle whose brake system has been in operation for over 75,000 km, replace the existing fluid with new fluid.