Preliminary work

Remove cover over hydraulic unit (front luggage compartment cover) → 703019 REMOVING AND INSTALLING FRONT LUGGAGE COMPARTMENT COVER .
There are two types of luggage compartment covers (drawings below).

Fig 1: Identifying Luggage Compartment Cover
Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Fig 2: Identifying Luggage Compartment Cover
Courtesy of PORSCHE CARS NORTH AMERICA, INC.