Bleeding the brake system (air removal)

Bleed the brake system after any operations associated with a violation of the tightness of the system or if air enters the system (determined by "soft" brake pedals).

If during the repair the tightness of only one of the brake circuits was violated, then it is enough to pump only this circuit.

The bleeding method is also used for periodic brake fluid replacement (see chapter "Vehicle maintenance work").

1. When bleeding the brakes, keep the fluid level in both compartments of the master cylinder reservoir at a sufficient level, otherwise even 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 must not be reused. In addition, liquid that has been stored in leaky packaging must not be used.

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

ATTENTION: On vehicles with a brake pressure control valve, the valve lever must be pressed towards the rear axle beam during bleeding.

3. Remove the rubber cap from the bleeder port. Connect one end of the hose to the bleeder port, and immerse the other end in a transparent container filled with brake fluid (the end of the hose must be immersed in the liquid). Loosen the bleed screw about half a turn.

4. Ask an assistant to press the brake pedal; the brake fluid will then be pumped out into the vessel. If this does not happen, open the bleeder valve even more.


5. Continue depressing the brake pedal, making small (three second pauses), liquid will not come out of the hose without air bubbles.

6. Close the bleeder valve with the pedal fully depressed. Tighten the fitting just enough to make it tight. Remove the hose and put the protective cap on the fitting.

7. Repeat the bleeding procedure on the other rear brake and then on the front brakes in the above sequence.

8. If after such pumping the brake pedal remains "soft", bleed the brakes under pressure. With the bleeder valve closed, pressurize the system by depressing the pedal several times, then, with the pedal depressed, open the bleeder valve, and after the fluid exits, close it without releasing the pedal. Repeat this procedure until clear fluid comes out of the hose without air bubbles, constantly adding fluid to the master cylinder reservoir.