Bleeding the brakes is necessary to remove air from the hydraulic drive. Air can enter the hydraulic drive due to depressurization of the system during repair or replacement of individual units, as well as when replacing the brake fluid. In case of depressurization from one of the circuits of the brake hydraulic drive, air should be removed only from this circuit. The presence of air in the brake drive is indicated by an increased pedal travel and its "softness".
It is recommended to use a special installation for bleeding hydraulic drives under pressure. If you do not have one, you can bleed the brake system by pressing the brake pedal. In this case, you will need an assistant. The efficiency of this method is lower, and the labor costs are greater than when using a special installation.
[The original article is posted on the resource AudiManual.ru]
Bleeding the brake hydraulic system (Audi 80 B2)
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