Removing brake booster

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Suck brake fluid out of the reservoir or pump out the brake fluid using the brake pedal via a front and rear brake calliper. Use a collecting bottle.
Pull electric line -Arrow- off the reservoir -A- . Undo the brake lines -Arrows- on the brake master cylinder -B- . Close the brake lines and connections with suitable plugs.

Fig 1: Locating Brake Lines On Brake Master Cylinder
Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
Remove hydraulic unit -D- together with the support and the four brake lines that are fitted on the intermediate piece -E- , → 453019 REMOVING AND INSTALLING HYDRAULIC UNIT .
1. Brake fluid reservoir
2. Brake master cylinder
3. Brake booster
4. Hydraulic unit
5. Intermediate piece
  
  Fig 2: Identifying Brake Components
  Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
Information

The brake master cylinder must not be separated from the brake booster if both parts are to be re-used.
Undo the fastening nuts -1- on the brake master cylinder. Pull out brake master cylinder.
1. Brake master cylinder mount
2. Brake booster mount
  
  Fig 3: Identifying Brake Master Cylinder Mount
  Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
Pull the bellows back from the body and remove the lock nut -Arrow- . Separate the two push rods from each other.

Fig 4: Locating Push Rod Mount
Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
Disengage the vacuum line at the brake booster. Unscrew the two fastening screws (Torx) on the brake booster and remove the brake booster.