Removal air from the hydraulic drive system (Audi 100 C4)

Bleeding the hydraulic drive system is done in the same way as for the brake hydraulic drive, with the difference that the air bleed hose is put on the corresponding valve of the clutch slave cylinder. To ensure that the brake hydraulic drive fluid can be supplied to the clutch drive free of air, a second hose is installed on the air bleed valve of the front wheel brake. Before the actual air bleed process begins, you need to slowly press the brake pedal (both air bleed valves are open), so that the brake fluid circuits can be connected.

Air must be bled from the system whenever hydraulic lines have been loosened or if air has otherwise entered the system.

[This article was copied from an online resource AudiManual.ru]