Use only fresh DOT 3 or DOT 4 brake fluid.
Air removal (pumping) from the hydraulic drive of the working brake system is necessary to remove air, which significantly reduces the braking efficiency. Air can get into the hydraulic drive due to depressurization of the system during repairs, replacement of individual components or brake fluid. The presence of air in the drive is indicated by an increased stroke of the brake pedal and its «softness». Before removing air, check the tightness of all brake drive units and their connections.
In the process of pumping the brake system, the level of the brake fluid should not fall below the middle of the reservoir of the hydraulic drive of the service brake system.
Pumping is carried out with an assistant.
Bleed the brakes in the following sequence:
- 1 - rear right working cylinder of the brake;
- 2 - rear left working cylinder of the brake;
- 3 - front right brake caliper;
- 4 - front left brake caliper.
Raise the vehicle.
Remove the dust cap from the bleeder fitting, clean it, put one end of a clean transparent hose on it, lower its 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. Once the pedal has reached its full forward position and fluid has stopped flowing through the hose, 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 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 rest of the wheels.
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