TM 9-2330-294-14
Section VII. BRAKE M A I N T E N A N C E
type design. When the semitrailer brake system is
a. Service Brakes (fig. 4-23). The air-operated
connected to the towing vehicle air brake system,
service brakes on the semitrailer are self-adjusting,
the towing vehicle brake system controls the brakes
internal-expanding and of a dual-actuating, wedge-
on both vehicles.