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Home >> Porsche >> 2011 >> 911 Speedster >> Repair and Diagnosis >> Suspension >> Front Suspension >> 4X - Chassis - General -- CARRERA (997) >> WM 4X00IN Central Wheel Lock: Component Assessment(CARR. GTS Coupe, CARR. GTS CABRIO, Turbo Coupe, Turbo S Coupe, Turbo CABRIO, Turbo S CABRIO, Gt3, Gt3 RS, Gt2 RS, Gt3 RS 4.0) >> 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: Checking Wheel Adapters
    G09825459Courtesy 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.
    G09825460G09825461

    • Additional picture: 
    G09825460G09825461
    G09825462
    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: Checking Correct Wheel Contact Surface
    G09825463Courtesy of PORSCHE CARS NORTH AMERICA, INC.
    Assessment of wheel contact surface
    Looks normal for a vehicle that has been driven  Excessive signs of wear 
    Discolouration or slight irregularities on the surface 
    → Wheel contact surface OK 
    • Discolouration 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.
    G09825464G09825465

    • Additional picture: 
    G09825464G09825465
    G09825466
    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 Correct Brake Disc
    G09825467Courtesy of PORSCHE CARS NORTH AMERICA, INC.
    Brake disc assessment
    Looks normal for a vehicle that has been driven  Excessive signs of wear 
    Discolouration or slight irregularities on the surface 
    → Brake disc OK 
    • Discolouration 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.
    G09825468G09825470

    • Additional picture: 
    G09825468G09825470
    G09825469
    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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