To remove air from the system, you need to bleed the brakes. The procedure for bleeding the brakes is quite simple, but it is more convenient to do it with an assistant.
1. After making sure that the reservoir on the master cylinder is full, clean the bleed nipple on one of the rear brakes from dirt and put a rubber hose of the appropriate diameter on the nipple. Lower the end of the hose into a transparent container with a small amount of brake fluid, ask an assistant to press the brake pedal several times and hold it in the pressed position.
2. Loosen the nipple slightly with a wrench until the pedal "falls through" and liquid with air bubbles starts to flow from the hose. Without releasing the pedal, tighten the nipple. Repeat the operation until the release of bubbles stops.
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3. After bleeding the rear wheel brake, bleed the front wheel brake of the same circuit in the same way.
Warnings! The cars use a diagonal brake drive, i.e. if you bleed the rear right wheel, then bleed the front left.
When bleeding the brake system, do not forget to periodically check the brake fluid level in the master cylinder reservoir and top it up if necessary.