6.2.3. Removal of air from a hydraulic actuator of the working brake system

Use only the fresh DOT 3 or DOT 4 brake fluid.

Removal of air (pumping) from a hydraulic actuator of the working brake system it is necessary for removal of the air considerably reducing efficiency of braking. Air can get to the hydraulic drive owing to depressurization of system at repair, replacement of separate knots or brake fluid. Point the increased course of a pedal of a brake and its "softness" to availability of air in the drive. Before removal of air check tightness of all knots of the drive of brakes and their connections.

In the course of pumping of the brake system the level of brake fluid should not fall below the middle of a tank of a hydraulic actuator of the working brake system.

Pumping is carried out with the assistant.

Carry out pumping of brakes in the following sequence:

1 – back right working cylinder of a brake;

2 – back left working cylinder of a brake;

3 – forward right support of a brake;

4 – forward left support of a brake.

Lift the car.

Remove a dustproof cap from the pumping union, clear it, put on it one end of a pure transparent hose, lower other its end in the capacity which is partially filled with brake fluid.

Sharply press a pedal of a brake of 3-5 times with an interval 2–3 with, and at the pressed pedal of a brake unscrew the pumping union on a half of a turn. Continuing to press a pedal, force out the liquid which is in system together with air through a hose in capacity. After the pedal will reach extreme forward situation and the liquid effluence through a hose will stop, screw the pumping union to the full. Repeat these operations, the air outlet from a hose will not stop yet.

Holding a pedal in the pressed situation, screw up the pumping union against the stop and remove a hose from the pumping union.

Wipe the union of pumping and establish a protective cap.

Repeat these operations for other wheels.