When bleeding the brake system, make sure there is fluid in the reservoir, and do not allow its bottom to become exposed. Before you start bleeding, eliminate the influence of the vacuum booster by pressing the brake pedal several times.
Remove air first from one circuit, then from the other, starting with the rear brake wheel cylinders.
Add brake fluid to the reservoir to the normal level.
Remove the protective caps from the air outlet fittings. Clean the fittings from dust and dirt.
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Place a transparent tube on the head of the brake nipple of the right rear wheel and lower its free end into a container partially filled with clean brake fluid. Press the brake pedal to create pressure in the brake hydraulic system. If no resistance is felt when pressing the pedal, press it slowly and continuously until pressing requires some effort. Unscrew the nipple with the pedal pressed all the way. After this, the assistant should slowly press the brake pedal and slowly release it, while the liquid together with air will be forced out of the system through the hose into the container. Repeat this process until bubbles stop coming out and clean liquid starts coming out of the hose, hold the pedal in the pressed position and tightly screw the nipple to release air. Remove the hose and put a protective cap on the nipple.
Repeat the operations for the other wheels.
After bleeding, restore the brake fluid level in the reservoir if necessary. Do not use the fluid drained from the system to fill the reservoir, as it is saturated with air, contains a lot of moisture and may be contaminated.