Bleeding the brakes is necessary to remove air from the hydraulic drive. Air can get into the hydraulic drive due to depressurization of the system during repair or replacement of individual units, as well as when replacing the brake fluid. The presence of air in the brake drive is indicated by an increased pedal travel and its "softness". If the master cylinder was removed on cars with 5-cylinder engines, then remove air from the clutch slave cylinder before bleeding the brakes.
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.
Bleeding the brake hydraulic system (Audi 100 C3)
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