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User's Manual

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UHB800-CAM
GLOSSARY OF TERMS
Spring Brake: Generally refers to a tandem chamber actuator that incorporates an air-applied service brake
chamber or an air-released/spring applied parking or emergency brake chamber. Spring brakes apply upon
sudden air loss (emergency mode) or activation of a dash-mounted parking brake control. Spring brakes remain
applied until that chamber is recharged or the spring is manually compressed or caged. The spring portion often
is referred to as the piggyback. Some spring brake actuators do not incorporate a service air chamber and are
solely parking and emergency brakes. For example, some parking brakes are applied by air pressure and
subsequently held mechanically by a pawl which drops into a notch on the brake chamber push rod.
Stroke: Refers to a total distance traveled by a brake chamber push rod or slack adjuster arm during brake
application.
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 Spicer FC shoes.
XtraLife: Spicer’s 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.