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Diagnosis And Testing - Brake Drum: RUNOUT

WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.

A runout measurement can be done along with the out-of-round measurement.

  1. Mount the drum on an off-vehicle brake lathe following the manufacturers instructions.
  2. Mount a dial indicator on the lathe and position the indicator needle against center of the brake drum machined surface.
  3. Slowly rotate the drum by hand  recording high and low indicator readings through a 360° rotation.

Drum braking surface runout must not exceed 0.050 mm (0.002 inch). If the measurement is not within specification, reface or replace the drum. (Refer to BRAKES/HYDRAULIC/MECHANICAL/DRUM - STANDARD PROCEDURE) . Always replace the drum if machining will cause the diameter to exceed drum maximum diameter. All brake drums are marked with the maximum allowable brake drum diameter. See Figure.

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