IC Bus CE Series 2020, Operation And Maintenance Manual

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Vehicle Inspection Guide
Interior Visual and Operational Checks (cont.)
Component Description
Air Brake Check
Check the air brakes as follows:
• Install wheel chocks.. Push in parking brake and start engine
• Check the air compressor or governor cut-out pressure (approximately 120 psi [827 kPa]).
• Turn engine OFF and then turn key to ON position.
• Without brake pedal applied, note air pressure drop for one minute([It should be less than 2 psi (14 kPa)
• Depress and hold brake pedal making sure there is no more than a 3 psi (21 kPa) per minute pressure
drop. For combination vehicles, there should be no more than 28 kPa (4 psi) per minute pressure drop.
• Step on and off brake pedal and check for warning indicator and buzzer to come on at about 60 to 70
± 6 psi (414 to 483 kPa)
Air Brake Check (Cont)
• Step on and off brake and check to ensure the parking brake knobs pop out between 20 and 45 psi
(138 to 310 kPa)
• Restart engine, shift into a low gear, and gently pull against service and parking brakes separately to
ensure they will hold.
Hydraulic Brake Check
Pump the brake pedal three times. Then apply firm pressure to the pedal and hold for five seconds. The
pedal should not move, and the brake pressure indicator should not illuminate.
Accelerator Pedal Check for smooth, non-binding pedal action.
Shift Selector
NOTE: Foot brake pedal must be pressed to shift out of the Park (P) position.
Check for proper functioning of the shift selector and linkage.
Parking Brake Check
NOTE: Foot brake pedal must be pressed to release the parking brake and to shift out of the Park (P)
position.
With foot on brake pedal, shift the transmission into a forward gear. Take your foot off the service brake pedal,
and allow the bus to idle forward. If the bus moves forward, the parking brake has malfunctioned. Stop the
bus with the service brake and have the vehicle serviced immediately.
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