12:11. Pumping of the hydraulic brake system


During removal of air constantly you monitor availability of brake fluid in a tank, without allowing an exposure of its bottom as at the same time air will get to system again.

Pumping of the hydraulic drive of brakes is necessary for removal of air which considerably reduces efficiency of braking. Air can get to the hydraulic drive owing to depressurization of system at repair, replacement of separate knots or brake fluid. Points 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.


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

2. Sharply press a pedal of a brake of 3-5 times with an interval 2–3 sec. Unscrew on a turn floor the pumping union at the pressed pedal. Continuing to press a pedal, force out a nakhodyashcha юся in system liquid 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.
3. Holding a pedal in the pressed situation, screw up the pumping union against the stop and remove a hose.
4. Wipe the union of pumping and establish a protective cap.
5. Repeat these operations for other wheels.
6. At absence in system of brakes of air, the pedal has to pass about a half of the course. To exclude influence of the vacuum amplifier on rolling of brakes, you make removal of air at the idle engine.