1-13. BRAKE SYSTEM (Con't).
Mechanically actuated by connection of fuel loading transfer hose
Brake Interlock Valves
to front port or rear inlet. Causes air system to lose air pressure
which sets semitrailer parking/emergency brakes.
1-14. SUSPENSION SYSTEM.
The semitrailer uses a tandem axle suspension with front, center, and rear frame
hangers welded to frame.
The suspension system functions to tie front and rear axles together and to permit
independent vertical movement of each axle as determined by road surface.
Springs are supported and held in place between three frame hangers: two serve as
mounts for radius rods, while the third furnishes support for rear spring end.
Rubber bushings at most points of movement in suspension serve to cushion road