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Multiple Disc Brake & Front Planetary Gear: Inspection

WARNING: This page does not describe the selected car, but rather 22 other vehicles, including the 2005 Lexus SC 430, 2005 Lexus IS 300, 2005 Lexus GS 430, 2005 Lexus GS 300, and 2004 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. Clean all components (except discs) with solvent. Dry with compressed air. Inspect plates and discs for flaking or burnt areas.
  2. Measure inside diameter of front and center planetary sun gear bushing. Maximum diameter for both bushings is .976" (24.79 mm). See Figure. Replace components if damaged or not within specification.
  3. Measure planetary pinion gear thrust clearance. See Figure. Standard clearance should be .008-.024" (.20-.61 mm). Maximum clearance is .039" (1.00 mm). If clearance is not within specification, replace planetary gear assembly. Check brake return spring free length. Include spring seat in measurement. Standard free length is 1.449" (36.80 mm).
  4. Check operation of one-way clutch. Hold front and center planetary sun gear and turn hub. See Figure. Hub should turn freely clockwise and locks counterclockwise.
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