Bleeding the brake system

Bleeding the brake hydraulic drive is necessary to remove air, which significantly reduces the effectiveness of the working brake system. Air can get into the hydraulic drive due to depressurization of the system during the repair or replacement of individual components, as well as the replacement of the brake fluid. The presence of air in the drive is indicated by an increased stroke of the brake pedal and its "softness". Before bleeding, check the tightness of all brake drive units and their connections. Bleed the entire brake drive system in the following sequence:

• right rear wheel;
• left rear wheel;
• right front wheel;
• left front wheel.

Attention. If the vehicle has an ABS system. then when pumping, the car must be on wheels, because otherwise the rear wheel brake cylinders will be disconnected from the system by pressure regulators.

Remove the connector from the brake fluid level sensor on the reservoir. Remove the tank cap and set it aside. In this case, the cork cannot be turned over. Remove the dust cap from the wheel cylinder bleeder port. Clean the bleeder fitting and put a clean transparent hose on it, the other end of which must be lowered into a container partially filled with brake fluid.

The container must be at least 300 mm above the bleeder port. This prevents air from entering the cylinder through the bleed screw threads. Sharply press the brake pedal 3-5 times with an interval of 2-3 seconds, unscrew the bleeder valve half a turn while pressing the pedal. Continuing to press the pedal, force the fluid in the system together with air through the hose into a container.


After the pedal reaches the extreme forward position, and the flow of fluid through the hose stops, screw the bleeder in until it stops. Repeat these operations until the air flow from the hose stops.

While holding the pedal down, screw the fitting all the way in and remove the hose. Wipe the bleeder valve and install the protective cap. Repeat operations for other wheels. When removing air, make sure that there is liquid in the tank, not allowing its bottom to be exposed, since this will again allow air to enter the system. If there is no air in the brake actuator, the brake pedal should travel about half of its travel.

To eliminate the influence of the vacuum booster on bleeding the brakes, remove air with the engine off. After bleeding the brake system, install the cap on the tank and connect the electrical connector.