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Home >> Porsche >> 2021 >> Taycan Base >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> 47 Brakes - Brake Hydraulic System, Regulator, Booster 2.0L -- Y1A - TAYCAN (Y1A) >> WM, 470107 Bleeding Brake System >> Bleeding Brake System >> Bleeding The Brake System - Bleeding Routine For Electric Brake Booster

Bleeding The Brake System - Bleeding Routine For Electric Brake Booster

  1. Open and remove cap on brake fluid reservoir.
  2. > VAS 6860 - Connect brake filling and bleeding equipment  to reservoir and switch on.
  3. Set the bleeding pressure to 2.0 bar.

    Information 

    The terms "Ignition on" and "Starting engine" are re-defined for fully electric vehicles (battery electric vehicles - BEV).

    Establishing operational readiness/Ignition on: 

    Prerequisites for establishing operational readiness: High-voltage battery is sufficiently charged, remove vehicle charging cable from the vehicle charge port, put driver's key in the emergency start tray.

    Establishing operational readiness automatically: Get into the vehicle and close the driver's door. The driver's key is recognized inside the vehicle. Operational readiness is established.

    Establishing operational readiness manually: Press Start/Stop switch. The driver's key is recognized inside the vehicle. Operational readiness is established.

    Establishing operational readiness/Starting engine: 

    Establish operational readiness and engage transmission range. The vehicle is now ready to drive and can be moved.

    Ending operational readiness/Switching off ignition 

    Ending operational readiness automatically: Get out of the vehicle with the driver's key and close the driver door. The driver's key is no longer detected outside the vehicle. Operational readiness ends.

    Ending operational readiness manually: Press Start/Stop switch until the instrument cluster is switched off.

    Ending driving readiness/Stopping engine 

    Vehicle is stationary: Press the P button on the instrument cluster. The vehicle is parked.

  4. Bleed the brake system using the PIWIS Tester  .
    1. 4.1  Connect the PIWIS Tester  to the vehicle and switch on the PIWIS Tester  .
    2. 4.2 Establish operational readiness/ignition on. 
    3. 4.3  Start diagnostics.
    4. 4.4  Select "Brake booster"  control unit.
    5. 4.5  Select the "Maintenance/repairs"  tab.
    6. 4.6  Select the function "Commissioning and bleeding"  and press F12 to continue.
    7. 4.7  Follow the instructions on the Tester.
  5. Close and tighten bleeder valves.

    Front bleeder valves (grey cast iron): 

    > Tightening torque 14 Nm (10.5 ftlb.) 

    Front bleeder valves (PCCB): 

    > Tightening torque 20 Nm (15 ftlb.) 

    Rear bleeder valves (grey cast iron): 

    > Tightening torque 14 Nm (10.5 ftlb.) 

    Rear bleeder valves (PCCB): 

    > Tightening torque 20 Nm (15 ftlb.) 

  6. Remove and empty collecting bottle, then carefully remove brake fluid residues from components, if necessary.
  7. > VAS 6860 - Switch off brake filling and bleeding equipment  and detach connecting line from adapter.
  8. Unscrew adapter on brake fluid reservoir.
  9. Visually check the brake fluid level and correct, if necessary. The brake fluid level must be between the MIN and MAX markings -1-  .
    G15553549Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Min/Max markings for brake fluid

  10. Screw on reservoir cap -1-  and tighten by hand.
    G15553550Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    Cap on brake fluid reservoir

  11. Establish operational readiness/switch on ignition, check brake pedal travel and pedal feel.
    1. 11.1  If the pedal travel or pressure point is not OK, repeat the bleeding routine.
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