Astro, Safari 1997-2005

Brake Disc (Rotor)

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Inspection



  1. Raise and safely support the vehicle.
  2.  
  3. Remove the wheel and tire assemblies.
  4.  
  5. To check the disc run-out, perform the following procedures:
    1. Using a dial indicator, secure and position it so that the button contacts the disc about 1 in. (25mm) from the outer edge.

      Click image to see an enlarged view

      Fig. Use a dial indicator to determine brake disc run-out

    2.  
    3. Rotate the disc. The lateral reading should not exceed 0.004 in. (0.1mm). If the reading is excessive, recondition or replace the disc.
    4.  

  6.  
  7. To check the disc parallelism, perform the following procedures:
    1. Using a micrometer, check the disc thickness at 4 locations around the disc, at the same distance from the edge.
    2.  
    3. The thickness should not vary more than 0.0005 in. (0.013mm). If the readings are excessive, recondition or replace the disc.
    4.  

  8.  
  9. The surface finish must be relatively smooth to avoid pulling and erratic performance, also, to extend the lining life. Light rotor surface scoring of up to 0.015 in. (0.38mm) in depth, can be tolerated. If the scoring depths are excessive, refinish or replace the rotor.
  10.  

 
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