Attention: if the presence of air in the cavity of the main brake cylinder is expected (further - GTZ), then before releasing air from the wheel cylinders, air must be removed from this cylinder.
2. Fill the master cylinder reservoir with brake fluid. When bleeding the brakes, keep the master cylinder expansion tank at least half full of fluid.
3. Disconnect the front brake pipe from the GTZ.
4. Let the brake fluid fill the GTZ until it starts to flow out of the holes used to connect the front pipelines.
5. Connect the front brake pipe to the main brake cylinder and tighten the brake lines to 16 Nm.
6. Slowly depress the brake pedal once and, while holding it, loosen the front brake line on the GTZ to bleed air from the cylinder.
7. Tighten the brake pipe to 16 Nm and slowly release the brake pedal. Take a break for 15 seconds before starting the next action.
Attention: slow pressing the brake pedal and pauses of 15 seconds are required so that a portion of the fluid that compensates for the loss of fluid released through the bleed valve has time to flow from the expansion tank into the cavity of the brake cylinder.
8. Repeat the above steps in the same sequence, including a break of 15 seconds, until all air is released from the cavity of the master brake cylinder (a sign of the end of the process: a liquid that does not contain air bubbles will come out from under the thread).
Note: Contact with brake fluid can cause damage to the paintwork and destruction of the polymer parts of the car.
9. After removing all the air from the cavity of the primary piston, remove the air from the cavity of the secondary piston.
Attention: for cars without ABS, the sequence for bleeding air from the branches of the brake system is as follows:
- right back,
- left front,
- left rear,
- right front.
10. Put a transparent tube on the valve and immerse its end in a transparent container with brake fluid.
11. Slowly press the brake pedal once and, while holding it, loosen the bleed valve on the wheel brake cylinder. In this case, fluid will flow from the tube into the container, the brake pedal will go down.
Note: In one pumping cycle, the amount of fluid discharged should correspond to no more than about 1/2-2/3 of the pedal travel.
12. Tighten the bleed valve to 9Nm.
13. Slowly release the brake pedal.
14. Repeat the above steps, including a pause of 15 seconds, until a clear liquid without air bubbles flows out of a tube immersed in a transparent container with brake fluid. It may be necessary to repeat these steps 10 times or more to remove all air.
15. After removing air from the branch of the system, remove the tube, check the tightness of the bleeding valve and install a protective cap on it. Check the brake pedal for «softness» at the end of her turn. Repeat the entire procedure if the pedal is still too «soft».