When the hydraulic system components are partially disconnected and appropriate precautions are taken to prevent further fluid loss, only the affected portion of the system may be bled.
Perform the pumping together with an assistant.
Press the brake pedal several times with the engine off to create a uniform pressure in the vacuum booster cavities, close to atmospheric pressure.
Remove the cap from the brake fluid reservoir, add brake fluid and replace the cap.
When bleeding the brake system, make sure that the brake fluid level does not fall below the middle of the reservoir.
Caution! While bleeding the brake system, constantly monitor the level of brake fluid in the reservoir, making sure not to expose the bottom, as this will reintroduce air into the system.
Remove the dust cap from the bleed nipple of the rear right wheel's working brake cylinder, clean it and attach a clean transparent hose to it, lowering 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 seconds, and with the brake pedal pressed, unscrew the bleed screw by half a turn. While continuing to press the pedal, force the fluid in the system along with the air through the hose into the container. Once the pedal reaches its lowest position and the fluid stops flowing out through the hose, tighten the bleed screw all the way. Repeat these operations until no more air comes out of the hose.
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While holding the pedal down, tighten the bleed screw until it stops and remove the hose from the bleed screw.
Wipe the bleed nipple clean and install the protective cap.
Repeat these operations for the other wheels in the following order:
- left rear wheel;
- right front wheel;
- left front wheel.
Store clean brake fluid in a sealed container, as it absorbs moisture from the air, which lowers the boiling point of the fluid and creates conditions for corrosion of brake system components.
Check the brake fluid level in the brake system expansion tank and top it up to normal if necessary.
After bleeding is complete, press the brake pedal all the way down until it reaches about half of its travel.