Removing Hydraulic Unit

Information 

• When fitting the hydraulic connections, leave electric plug connections connected to the control units for as long as possible. This prevents the electric plug connections from being splashed with brake fluid or water. 
• Wipe off damp electric plug connections before disconnecting them. Use appropriate protection for electric plug connections if necessary. 
• Brake fluid on electric contacts (even thinned brake fluid) causes corrosion and can result in faults in the system. 
• Do not bend the brake lines in the hydraulic unit area. 
• Clean connection points of the brake lines, but not with cleaning agents. 
• Rinse off any brake fluid emerging thoroughly with water. 

Information 

Always switch off the ignition when working on the hydraulic unit!

1. Remove brake lines -1-  .

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Brake lines on hydraulic unit

   1. 1.1  Open brake line holder -2-  and remove it.
   2. 1.2  Mark three brake lines -1-  to prevent them from being confused.
   3. 1.3  Loosen union nuts on the brake lines -3-  and counter at the hydraulic unit at the same time.
   4. 1.4  Pull brake lines -2-  out of the bores and close off brake lines -2-  and bores immediately using suitable stoppers. Soak up any emerging brake fluid using suitable aids.
   5. 1.5  Carefully move the brake lines -1-  aside and secure them if necessary.
2. Only for PHEV vehicles: Release return line -1-  .

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Return line (PHEV only)

   1. 2.1  Unscrew banjo bolt for the return line -2-  , countering on the hydraulic unit.
   2. 2.2  Pull return line -1-  out of the bore and close off return line -1-  and bore immediately using suitable stoppers. Soak up any emerging brake fluid using suitable aids.
   3. 2.3  Carefully move the return line -1-  aside and secure it if necessary.
3. Disconnect supply lines

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Supply lines on hydraulic unit

   1. 3.1  Mark one supply line -1-  to prevent it from being connected incorrectly.
   2. 3.2  Loosen union nuts on the supply lines -2-  and counter at the hydraulic unit at the same time.
   3. 3.3  Pull supply lines -1-  out of the bores and close off supply lines -1-  and bores immediately using suitable stoppers. Soak up any emerging brake fluid using suitable aids.
   4. 3.4  Carefully move supply lines -1-  aside and secure them if necessary.
4. Remove hydraulic unit -4-  .

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Hydraulic unit

   1. 4.1  Release and disconnect electric plug connection.
      1. 4.1.1  Press clip -1-  downwards.
      2. 4.1.2  Push lever -2-  upwards -Arrow-  .
      3. 4.1.3  Disconnect electric plug connection from hydraulic unit -4-  .
   2. 4.2  Pull hydraulic unit -4-  up out of the rubber mountings and guide it out of the engine compartment.