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Home >> Porsche >> 2016 >> 911 Turbo, 2D Convertible >> Repair and Diagnosis >> Suspension >> Front Suspension >> 4X - Chassis - General -- 911 CARRERA (991) >> WM 4X00IN Central Wheel Lock: Component Assessment (CARRERA GTS, CARR. CABRIO, Turbo, CARRERA 4 GTS, Turbo S, TARGA 4 GTS, Turbo CABRIO, CARR. 4 GTS CABRIO, Turbo S CABRIO, Gt3, Gt3 RS) >> Central Wheel Lock: Component Assessment >> Assessment Of Wheel Adapters, Wheel And Brake Disc

Assessment Of Wheel Adapters, Wheel And Brake Disc

  1. Check wheel adapters → Checking wheel adapters  .
    Fig 1: Locating Wheel Adapters
    G09992744Courtesy of PORSCHE CARS NORTH AMERICA, INC.
    Assessment of wheel adapters 
    Look normal for a vehicle that has been driven  Excessive signs of wear 
    Light scratches on the surface 
    → Wheel adapters OK 
    • There are light scratches on the surface of the wheel adapters -arrows-  .
    • The scratches are caused by removing and fitting wheels and can be deeper scratches or just minor scrapes, depending on how often the wheel has been changed.
    		 Eloxal coating is completely worn down in places 
    → Wheel adapters not OK 
    • The red Eloxal coating on the wide surface is completely worn down on the cylindrical surface of the wheel adapters -arrow-  .
    • The wheel adapters must also be replaced if they can be turned by hand.
    G09992745G09992746

    Wheel adapters OK 
    • Additional picture: 
    G09992745G09992746

    Wheel adapters OK (1) 
    G09992747

    Wheel adapters not OK 
    Result/Action required 
    → The wheel adapters  do not  have to be replaced. → The wheel adapters  and wheel hub  must be replaced.
  2. Check the contact surface for the brake disc on the wheel  (→ Checking wheel contact surface  ).
    Fig 2: Locating Wheel Contact Surface
    G09992748Courtesy of PORSCHE CARS NORTH AMERICA, INC.
    Assessment of wheel contact surface 
    Looks normal for a vehicle that has been driven  Excessive signs of wear 
    Discoloration or slight irregularities on the surface 
    → Wheel contact surface OK 
    • Discoloration or slight irregularities on the surface due to the slightest movements while driving (micro-movements) are OK -arrow-  .
    • The contact surface is smooth (flat).
    • Material is not worn down.
    		 Material erosion 
    → Wheel contact surface not OK 
    • There is material erosion on the outer edge -arrow-  of the wheel contact surface.
    • The edge is worn down (eroded) so much that there is a radius on the outer edge -arrow-  .
    • The wheel contact surface is uneven.
    • Signs of wear can also be seen on the wheel hub  and brake disc  in accordance with the relevant description.
    G09992749G09992750

    Wheel contact surface OK 
    • Additional picture: 
    G09992749G09992750

    Wheel contact surface OK (1) 
    G09992751

    Wheel contact surface not OK 
    Result/Action required 
    → The wheel  does not  have to be replaced. → The wheel  and wheel hub  must be replaced.
    → If there are visible signs of wear on the brake disc  in accordance with the description below, the brake disc must also be replaced.
  3. Check the contact surface for the wheel on the brake disc  (→ Checking brake disc  ).
    Fig 3: Checking Brake Disc
    G09992752Courtesy of PORSCHE CARS NORTH AMERICA, INC.
    Brake disc assessment 
    Looks normal for a vehicle that has been driven  Excessive signs of wear 
    Discoloration or slight irregularities on the surface 
    → Brake disc OK 
    • Discoloration or slight irregularities on the surface due to the slightest movements while driving (micro-movements) are OK -arrow-  .
    • The contact surface is smooth (flat).
    • Material is not worn down.
    		 Material erosion 
    → Brake disc not OK 
    • Material erosion and some crater-shaped cracks can be seen on the wheel contact surface -arrow-  .
    • The contact surface is uneven.
    G09992753G09992754

    Brake disc OK 
    • Additional picture: 
    G09992753G09992754
    		 Brake disc OK (1) 
    G09992755

    Brake disc not OK 
    Result/Action required 
    → The brake disc  does not  have to be replaced. → The brake disc  , wheel adapters  and wheel hub  must be replaced.
    → If there are visible signs of wear on the wheel contact surface  in accordance with the previous description, the wheel  must also be replaced.
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