IC Bus Gasoline CE Series, Operation And Maintenance Manual, Page: 139 / 241

Operation
To release Air Parking Brake
1. Have the engine running and your foot on the service
brake pedal.
2. Push in the control knob.
3. Wait until system pressure has reached 70 psi.
NOTE: DO NOT operate vehicle until system pressure has
reached 70 psi.
NOTE: To release the parking brake on vehicles with the
optional wheelchair lift, the lift must be completely retracted
and stowed.
Air Parking Brake Control Knob
Air Brake Gauge
The air operated parking brake has an air gauge and warning
buzzer. When pressure in the parking brake air reservoir has
been reduced to about 57 psi (393 kPa), the buzzer sounds.
A loss of pressure in the control circuit prevents normal operation
of the parking brake.
CAUTION
To prevent property / vehicle damage, if air
system pressure falls below 70 psi (483 kPa),
pull off the roadway, set the parking brake, and
correct the low pressure condition.
If air pressure is reduced to approximately 40 psi (276 kPa) in
both the primary and secondary systems, the parking brakes will
automatically apply.
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