Control unit - removal and installation
1. Disconnect the negative battery cable.
2. Remove the trim under the panel on the driver's side.
3. Disconnect the electrical wiring, unscrew the fastening screws and remove the control unit.
4. Installation is carried out in the reverse order.
Control switch - removal and installation
5. Control switch - part of the combined steering column switch, refer to the removal and installation procedure Chapter 5.
Clutch/Brake Pedal Valves
6. Disconnect the negative battery cable.
7. Remove the trim panel or package shelf as needed to gain access to the clutch and brake pedals.
8. Disconnect the electrical wiring and vacuum hose from the corresponding valve, then remove the block from the holder. A special tool Audi 2041 is available for removing the valves, but even with a special tool, the valves must be discarded after removal, as this will damage the threads.
9. To install new valves, place them in their holders as far as possible.
10. Raise the clutch or brake pedal as far as possible to set the valve adjustment.
11. Install trim, connect battery.
Vacuum drive - removal and installation
12. Disconnect the throttle link on the vacuum drive unit.
13. Disconnect the vacuum hose.
14. Turn off a lock nut, remove the block of a vacuum drive.
15. Installation is carried out in the reverse order.
16. To adjust the link, check the clearance at the point where the link rod touches the vacuum actuator bushing with the throttle at rest (photo). The gap should be 0.1-1.0 mm. If necessary, adjust the fixing nut in the center of the link rod.
Vacuum pump - removal and installation
17. Remove the screws securing the expansion tank of the cooling system, move the reservoir to the side.
18. Disconnect the vacuum hoses and electrical wiring connector, then unscrew the screws and remove the pump.
19. Installation is carried out in the reverse order.
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