BRAKE DRUM RE-BORE LIMITS AND/OR MAXIMUM WEAR DIAMETER
This information is furnished to advise the importance of the re-bore limits and/or maximum wear
diameter as shown on our Webb brake drums. This dimension is cast on our brake drums as
indicated on the drawing below. The dimension is the maximum safe diameter to which a drum may
be turned, ground, and/or worn.
To insure product safety, it is critical that any brake drum reaching this dimension by turning,
grinding, and/or wearing be considered unsafe and immediately replaced. Any brake drum
exceeding this dimension is considered a safety hazard, and is not subject to warranty
The dimension shown on our brake
drums is the current maximum
diameter and supersedes any
previously published information.
Most Webb brake drums allow a
maximum diameter of 0.120 over
the nominal new diameter. This
allows 0.080 for re-boring and an
additional 0.040 for wear.