If during repairs the tightness of only one of the brake circuits was broken, then it is sufficient to bleed only this circuit.
The bleeding method is also used for periodic replacement of brake fluid (see chapter "Car maintenance work").
1. When bleeding the brakes, maintain a sufficient fluid level in both compartments of the master cylinder reservoir, otherwise more air will enter the system.
Use only fresh brake fluid to fill, top up or bleed the system. Fluid that has passed through the system should not be reused. Also, do not use fluid that has been stored in a non-hermetic container.
2. Bleed the brake system in the following sequence:
- I) Right rear brake
- II) Left rear brake
- III) Right front brake
- IV) Left front brake
CAUTION: On vehicles with a brake pressure regulating valve, the valve lever must be pressed towards the rear axle beam during bleeding.
3. Remove the rubber cap from the bleed nipple. Attach one end of the hose to the bleed nipple and immerse the other end in a transparent container filled with brake fluid (the end of the hose must be immersed in liquid). Loosen the bleed screw about half a turn.
4. Ask an assistant to press the brake pedal; the brake fluid will be pumped out into the container. If this does not happen, open the bleed nipple even more.
5. Continue pressing the brake pedal, making small (three second pauses), liquid will not come out of the hose without air bubbles.
6. Close the bleed nipple with the pedal fully depressed. Tighten the nipple just enough to make it airtight. Remove the hose and put the protective cap on the nipple.
7. Repeat the bleeding procedure on the other rear brake, and then on the front brakes in the above sequence.
8. If after such bleeding the brake pedal remains "soft", bleed the brakes under pressure. With the bleed nipple closed, create pressure in the system by pressing the pedal several times, then with the pedal pressed, open the bleed nipple, and after the fluid comes out, close it without releasing the pedal. Repeat this procedure until clean fluid without air bubbles comes out of the hose, constantly adding fluid to the master cylinder reservoir.
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