User's Manual

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BW7248
GLOSSARY OF TERMS
Supply Tank: The air reservoir immediately downstream of the air compressor.
T Brake: Rockwell’s term for a front brake shoe design using a single web with a closed anchor pin end.
Threaded Drum: Brake drum resurfaced on a lathe too quickly, resulting in a friction surface similar to that of a
scored drum.
Tire Rolling Radius: The distance, expressed in inches, from the center of a tire to the pavement, measured
when mounted on a vehicle and loaded to its maximum capacity.
TMC: Maintenance Council
Turned Drum: A brake drum that has been resurfaced on a lathe to remove scoring or other defects.
Wedge Brake: As opposed to a brake applied by a s-cam, this type of brake is applied by a single or double
wedge type mechanism. This type of brake is self-adjusting and, as such, does not utilize a slack adjuster.
XEM: Xtra Easy Maintenance, Fruehauf’s term for brake design with an open anchor pin rib. This shoe will not
interchange with Rockwell Q and Bendix FC shoes.
XtraLife: Bendix’ term for a quick-change design brake shoe using thicker than standard lining. Available in both
the original XtraLife design, and the new XtraLife II version.