TM 9-2330-247-14&P
1-12. BRAKE SYSTEM (Con't)
Service Brake System. The brakes are air over hydraulic. An airbrake chamber attached to the master cylinder
provides the means of converting the energy of compressed air into the hydraulic pressure necessary to operate the
trailer brakes, There are two brakeshoes and wheel cylinders mounted on a backing plate. When the brakes are
applied, the wheel cylinder pistons apply equal pressure against both ends of each brakeshoe. As the brakeshoe
linings come into contact with the brakedrum, braking action occurs.
Handbrakes. Handbrake levers mounted on the left and right sides of the trailer A-frame provide a mechanical braking
action directly to the brakeshoes through a handbrake cable. Handbrakes are applied when trailer is parked.
TA701027
1-9/(1-10 Blank)