By partially disconnecting the elements of the hydraulic system and taking appropriate precautions to prevent further loss of fluid, only the appropriate part of the system can be bled.
Perform pumping together with an assistant.
Press the brake pedal several times with the engine off to create the same pressure in the cavities of the vacuum booster, close to atmospheric pressure.
Remove the cap from the reservoir of the brake system, add brake fluid to it and replace the cap.
When bleeding the brake system, make sure that the brake fluid level does not fall below the middle of the tank.
Attention! In the process of pumping the brake system, constantly monitor the presence of brake fluid in the reservoir, avoiding exposing its bottom, as this will allow air to enter the system again.
Remove the dust cap from the rear right wheel brake cylinder bleeder, clean it and put a clean transparent hose on it, lower the other end into a container partially filled with brake fluid.
Press the brake pedal sharply 3–5 times with an interval of 2–3 s, and with the brake pedal depressed, unscrew the bleed valve by half a turn. Continuing to press the pedal, force the fluid in the system together with air through the hose into a container. After the pedal has reached its lowest position and fluid has stopped flowing through the hose, tighten the bleeder screw until it stops. Repeat these operations until the air flow from the hose stops.
While holding the pedal down, screw the bleeder in until it stops and remove the hose from the bleeder.
Wipe the bleeder valve and install the protective cap.
Repeat these steps for the other wheels in the following order:
- left rear wheel;
- right front wheel;
- left front wheel.
Store clean brake fluid in an airtight container, as it absorbs moisture from the air, which lowers the boiling point of the fluid and creates conditions for corrosion of parts of the brake system.
Check the brake fluid level in the brake fluid reservoir and top up if necessary.
After pumping is completed, press the brake pedal all the way down, while it should go about half of its travel.