How do you fill and bleed the pump on a Audi A4 cabriolet roof?

To fill and bleed the hydraulic pump on an Audi A4 Cabriolet roof, first, locate the hydraulic fluid reservoir, usually found near the pump. Use the appropriate hydraulic fluid to fill the reservoir to the specified level. Next, operate the roof mechanism several times to help purge air from the system, checking the fluid level and adding more as needed. Finally, repeat this process until no air bubbles are visible in the reservoir, ensuring smooth operation of the roof.