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Diagnosis And Testing - Brake Drum: Out-Of-Round

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 brake drum whose braking surface is out-of-round can cause vehicle vibration and brake pedal pulsation upon braking. To measure brake drum out-of-round, perform the following:

  1. Remove the drum from the vehicle.
  2. Using a brake drum micrometer, measure the inside diameter at several points around the inside of the drum on the machined surface. Record the measurements.

Drum braking surface out-of-round 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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