JLG G9-43A (9151-4003) Operator Manual - Manual (Page 30)

General
The brake system includes a service brake and a parking brake. Service and
parking brakes are applied through wet disc brake packs located within axle
housing.
Service Brakes
Depressing the service brake pedal causes controlled hydraulic pressure to be
applied to service brakes. The greater the pedal travel, the greater the braking
force.
If power-assist fails, it will require much greater force on pedal to apply the
brake, and stopping distance will be greater.
Parking Brakes (front axle only)
The parking brakes are spring-applied and hydraulically-released.
Pressure to release parking brakes is provided by the hydraulic system and is
controlled by the parking brake switch located on the dashboard.
With the engine running and the parking brake switch “Off”, parking brakes
are disengaged. Moving the switch to “On” releases hydraulic pressure to apply
the parking brakes. With switch in “On” position, the transmission will not
engage forward or reverse.
BRAKE SYSTEM
7.0
WARNING !
If power-assist feature should fail
for any reason, it would require
greater effort to apply service
brake. If power assist fails, stop
as soon as possible. Do not drive
the handler until problem has been
corrected.
WARNING !
Always move parking brake switch
to “On” position before leaving cab.
Never stop engine while traveling.
Parking brake will be fully-applied
and unit could stop abruptly. A
sudden stop could cause load loss.
WARNING !
Always ensure that transmission
control lever is in neutral before
releasing park brake. Releasing
park brake in either forward or
reverse could cause the machine
to move abruptly.