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Author Topic: Revised Minimum Rotor Thickness  (Read 4123 times)
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Newfie Hauler
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« on: June 09, 2006, 03:31:06 PM »

Due to the recent interest in brake system issues and I know that a number of owners have purchased paper service manuals.  I was doing some research into brake ystem issues and came across Techincal Service Bulletin (TSB) 04-05-23-002A that provides some revised specifications for the minimum allowable thickness after refinishing (turning) of the front disc brake rotors.  This applies to 2001-2004 Pontiac Azteks and 2002-2004 Buick Rendezvous, both FWD and AWD.

The revised minimum thickness spec is 28.4 mm or 1.118 in.  This revision applies to the front disc rotors only

The rear disc (AWD) minimum allowable thickness after refinishing is 10.6 mm or 0.42 in has not changed.  Also the specifications for discarding the rotors has not changed.  Front discs are 27.0 mm or 1.063 in and the rear disc (AWD) are 9.0 mm or 0.35 in.

Keep in mind that the rotor surface must be clean when making these measurements, the micrometer must be calibrated to the ten thousands of an inch and you must measure and record the thicknesses at four or more points, equally spaced around the rotor.  The lowest measurement that you record is the measurement that you use to compare to the figures above (it is not an average).  The maximum allowable thickness variation is 0.025 mm or 0.001 in).  If scoring is present, the maximum allowable scoring is 1.50 mm or 0.059 in.

The other key measurement, lateral runout requires the use of a dial indicator.  I am not sure how many people have them or have access to them.  Service information also provides those specifrications as well.  This measurement will provide you with the evidence that the rotors are the cause of brake pulsation.  The maximum allowable front lateral runout is 0.06 mm or 0.002 in.  That same figure appilies to the rear rotors on the AWD models.  If the rotor exceeds those specifications, it must be either refinsished or replaced.

Newfie Hauler
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