Power Brake Booster: Removal

Pry off gap cover below steering column (arrows). See Fig 1 . Unscrew cover. Remove lower insulation mat.
Remove spring clip or clevis pin and disconnect pushrod from brake pedal assembly. See Fig 2 .

Fig 1: Removing Lower Instrument Panel Cover
Courtesy of AUDI OF AMERICA, INC.

Fig 2: Exploded View Of Power Booster Assembly
Courtesy of AUDI OF AMERICA, INC.
Working under hood, remove plenum chamber cover. Attach bleeder hose of bleeder bottle to left-front brake caliper bleeder screw and open bleeder screw. Operate brake pedal to pump out as much brake fluid as possible.
Remove mounting bolt (3) for brake fluid reservoir. See Figure . Disconnect brake fluid level warning switch harness connector (2). Disconnect return hose (1) for clutch master cylinder (if equipped). On vehicles equipped with ESP, remove intake hose. To remove brake fluid reservoir, press engagement strap downward and simultaneously pull brake fluid reservoir out of gasket.
Disconnect brake lines from master cylinder. Seal brake lines and master cylinder openings.
Remove fasteners holding power booster and master cylinder to firewall. Remove power booster and master cylinder together.