G 1500 1/2 Ton Van V8-5.7L VIN R (1997)
Brake Drum: Testing and Inspection
Out-of-Round or Tapered
MEASURE FOR TAPER OR OUT-OF-ROUND
An-out-of-round or tapered drum prevents accurate brake shoe adjustment and is likely to cause excessive wear of other brake parts due to its
eccentric action. An out-of-round drum can also cause severe and irregular tire tread wear as well as a pulsating brake pedal. When the drum
exceeds the specification limits in taper and/or out-of-round, refinish the drum to true up the braking surface. Out-of-round and taper can be
accurately measured with an inside micrometer and extension rods. When measuring a drum for out-of-round and taper, take measurements at the
open and closed edges of the machined surface and at right-angles to each other.
