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Home >> Porsche >> 2019 >> Cayenne S >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 24 (47 Brakes - Brake Hydraulic System, Regulator, Booster 3.0L -- 9YA - Cayenne (9YA)) >> WM, 470107 Bleeding The Brake System >> Bleeding The Brake System

Bleeding The Brake System

WARNING: This page is about a different variant/trim than selected.
  1. Open and remove cap on brake fluid reservoir.

    Information 

    • Check brake fluid quality. Use only new Hydraulan 404 brake fluid. 
  2. > VAS 6860 - Connect brake filling and bleeding equipment  to the reservoir and switch on.
  3. Set the bleeding pressure to 2.0 bar.

    Information 

    • To check the escaping brake fluid, ensure absolute cleanliness and make sure there are no air bubbles. 
    • A transparent hose and a collecting bottle must be used to determine the amount of brake fluid used. 

    Information 

    • Bleed the brake calliper at both bleeder valves. 
    • Bleed the outer bleeder valve first. 
  4. Carry out the bleeding procedure on the brake callipers in the following sequence: rear right/rear left/front right/front left.

    Tightening sequence: Outer bleeder screw first, then inner bleeder screw. 

    G15289061Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Bleeder screw (shown on rear right brake calliper)

    1. 4.1  Connect hose of the collecting bottle to the bleeder valve.
    2. 4.2  Open bleeder screw -1-  until clear, bubble-free brake fluid emerges.
    3. 4.3  Close the bleeder screw -1-  .
    4. 4.4  Continue the bleeding procedure in the specified sequence until all 4 brake callipers have been bled.
    5. 4.5  Remove collecting bottle. Remove brake fluid residues from the components if necessary.
  5. Commission the electric brake booster using the PIWIS Tester  .
    1. 5.1  Connect the PIWIS Tester  to the vehicle and start it. Switch on ignition.
    2. 5.2  Start the diagnostic  software.
    3. 5.3  Select brake booster  control unit.
    4. 5.4  Select the Maintenance/repairs  menu.
    5. 5.5  Press F12 to select the start-up function  .
    6. 5.6  Follow the instructions on the PIWIS Tester  .

    Information 

    As soon as the brake system has been opened, the secondary circuit must also be bled on vehicles with electronic brake booster. This does not apply when you are just changing the brake fluid.

    Information 

    • To check the escaping brake fluid, ensure absolute cleanliness and make sure there are no air bubbles. 
    • A transparent hose and a collecting bottle must be used to determine the amount of brake fluid used. 

    Information 

    High brake fluid loss when bleeding:

    • Make sure that there is sufficient brake fluid left (the reservoir must not run dry). 
    • Empty the collecting bottle after every bleeding procedure. 

    Information 

    Press the brake pedal down fully about every 5 seconds.

  6. Bleed the secondary circuit using PIWIS Tester  .
    1. 6.1  Select 'Control unit overview'  → 'Porsche Stability Management (PSM)'  and press F12 to confirm.
    2. 6.2  Select 'Maintenance/repairs'  → 'Service bleeding'  and start the procedure.
    3. 6.3  Read the instructions displayed on PIWIS Tester  and pay particular attention to the following:
      1. 6.3.1  Leave the > VAS 6860 - brake filling and bleeding equipment  connected to the reservoir with 2.0 bar pressure.
      2. 6.3.2  Bleed the brake system at both bleeder screws on the brake callipers (Observe sequence shown on the PIWIS Tester!  ). Keep pressing the brake pedal at the same time (get another person to help  ).
      3. 6.3.3  Open each bleeder screw -1-  until clear, bubble-free brake fluid emerges.
      4. 6.3.4  Screw in and tighten each bleeder screw -1-  after bleeding the system.

        Front bleeder valves (grey cast iron/PSCB): > Tightening torque 14 Nm (10.5 ftlb.) 

        Front bleeder valves (PCCB): > Tightening torque 20 Nm (15 ftlb.) 

        Rear bleeder valves (grey cast iron/PSCB): > Tightening torque 14 Nm (10.5 ftlb.) 

        Rear bleeder valves (PCCB): > Tightening torque 14 Nm (10.5 ftlb.) 

    Information 

    The brake fluid level in the reservoir must be between the MIN and MAX markings after bleeding the brake system.

  7. Remove > VAS 6860 - brake filling and bleeding equipment  from the reservoir and correct the brake fluid level if necessary.
  8. Fit and lock cap on brake fluid reservoir.
  9. Switch on ignition and check brake pedal travel and pedal feel.


Information 

The pictures shown in this document may differ from the original.

Information 

The instructions in the PIWIS Tester  take precedence and in the event of a discrepancy, these are the instructions that must be followed. A discrepancy may arise with later software versions.

Information 

Information 

The pictures shown in this document may differ from the original.

  1. > 9900 - PIWIS Tester 3  must now be connected.
  2. Open cap on brake fluid reservoir -1-  .
    G15289065Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Adapter on reservoir

  3. Connect bleeding device adapter to reservoir -2-  .
    G15289066Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Adapter on reservoir

  4. Switch on the bleeding device. Bleeding pressure is approx. 2.0 bar.
  5. Bleed the brake system.

    Information 

    Use a transparent hose and a collecting bottle to check the escaping brake fluid for cleanliness, absence of air bubbles and to determine the amount of brake fluid used.

    1. 5.1  Fit collecting bottle hose to the bleeder valve.
    2. 5.2  Open bleeder valves on the brake callipers, starting at the front left brake calliper.
    3. 5.3  Open each bleeder valve until clear, bubble-free brake fluid emerges.
    4. 5.4  Repeat the procedure on all bleeder valves on the brake callipers one after the other. Observe the sequence specified in the PIWIS Tester  .

    (Front left/front right/rear right/rear left)

  6. Only when replacing the hydraulic unit: 

    Bleed the secondary circuit using the Porsche System Tester. To do this, select >> Porsche Stability Management >> Maintenance & repairs >> Service bleeding << in the control unit overview.

  7. Bleed the right-hand side of the vehicle manually  again. Start at the front right wheel.
  8. Tighten bleeder valves to the specified tightening torque and remove bleeder hoses.

    Front bleeder screw (grey cast iron/PSCB):  > Tightening torque 14 Nm (10.5 ftlb.) 

    Rear bleeder screw (grey cast iron/PSCB):  > Tightening torque 14 Nm (10.5 ftlb.) 

    Front bleeder screw (PCCB):  > Tightening torque 20 Nm (15 ftlb.) 

    Rear bleeder screw (PCCB):  > Tightening torque 14 Nm (10.5 ftlb.) 

    Information 

    • The brake fluid level must not exceed the MAX marking. 
    • Check brake fluid quality. Use only new Hydraulan 404 brake fluid. 
    • Brake fluid can be ordered using the Porsche Electronic Parts Catalogue (PET). 
  9. Switch off the bleeding device and remove the adapter at the reservoir. The brake fluid level in the reservoir must be between the MIN and MAX markings after filling and bleeding the vehicle -1-  . Correct the brake fluid level if necessary.
    G15289067Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Min/Max markings for brake fluid

  10. Close the cap on the brake fluid reservoir -1-  .
G15289068Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Brake fluid reservoir

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