Signs of the presence of air in the hydraulic drive:
- increase in pedal travel «softness» with a single press on the pedal;
- a gradual decrease in pedal travel with a simultaneous increase in its «rigidity» when you press the pedal again.
Before pumping the hydraulic drive, it is necessary to find and eliminate the cause of depressurization.
The steps for bleeding the hydraulic drive are the same as for replacing the brake fluid described. The only difference is that the criterion for completing the pumping of the working cylinder is the cessation of the release of air bubbles from the hose a, and not the appearance of fresh brake fluid.
Helpful advice: If hydraulic drive pumping is connected with the repair of any one circuit and the serviceability of the other circuit is known, then only the repaired circuit can be pumped.
Note: If after bleeding the hydraulic drive there are still signs of air in it, it is necessary to remove air from the ABS hydro-electronic unit. To do this, contact the service station that has the necessary equipment.