A-frame Roller Brake Operation
The hydraulically operated A-frame roller brakes are controlled by a switch on the chest pack. The
roller brake can be used whenever the operator deems it necessary to slow, or stop, bridging module
movement. The switch (Figure 3.18 (1)) that controls the roller brake is a three-position switch with a
central ON position and two OFF positions, one position a normal latched OFF, the other a spring
loaded momentary OFF position.
During much of the bridge build procedure, the roller brakes are not required, therefore,
they will be deactivated by placing the switch into the forward latched OFF position.
Roller Brake Operation (General)
To apply the roller brakes, set the switch (1) to the central ROLLER BRAKE ON position.
To release the roller brakes during bridge build, the operator should set the roller brake
three-position switch (1) from the central ON position to the rear spring-loaded OFF
position. With the switch in this position, should it be required, all the operator has to do is
remove his hand from the switch and the roller brake will be immediately applied.
If bridge build mode has been selected with the brake in the OFF position, the tilt roller will
be inoperative, as indicated by a flashing ROLLER BRAKE light (2) and the flashing TILT
ROLLER light (3) on the chest pack. To enable the tilt rollers, set the toggle switch (1) to
the central ON position to enable the tilt rollers.