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Old 02-23-2019, 12:38 PM   #1
Bus Nut
 
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Join Date: Aug 2018
Location: Santa Rosa, CA
Posts: 251
Year: 2007
Coachwork: ICCORP
Chassis: CE300
Engine: DT466
Rated Cap: 16
Air brake not releasing

The Bus has been parked for about 7-10 days. Yesterday I removed the harness for the lights and sensors for emergency exists.

Now the air brakes wont release. No alarms sound. Just the brakes wont release. Both tanks are at 120psi and I can hear the air cycling through as I press on the pedal. The pressure release valve also releases normally.

While it’s possible that the airbrake release switch is connected to the emergency exit circuit, I don’t know this for sure.

The bus is a 2007 IC CE.

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Old 02-23-2019, 12:45 PM   #2
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Join Date: Sep 2017
Location: Swansboro,NC
Posts: 2,973
Year: 86
Coachwork: Thomas
Chassis: Ford B700
Engine: 8.2
Rated Cap: 60 bodies
Has to be one of the exit sensors.
I always disconnected one and started the engine.
That way I knew exactly which one.
Maybe start with jumper wires to figure out which one?
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Old 02-23-2019, 01:03 PM   #3
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Join Date: Aug 2018
Location: Santa Rosa, CA
Posts: 251
Year: 2007
Coachwork: ICCORP
Chassis: CE300
Engine: DT466
Rated Cap: 16
Hooked the harness back up. Indeed it was the emergency exit sensors. Now to remove them.
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Old 02-23-2019, 01:07 PM   #4
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Join Date: Sep 2017
Location: Swansboro,NC
Posts: 2,973
Year: 86
Coachwork: Thomas
Chassis: Ford B700
Engine: 8.2
Rated Cap: 60 bodies
Maybe just a jumper wire in the control panel to prove it closed?
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Old 02-23-2019, 01:09 PM   #5
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Join Date: Aug 2018
Location: Santa Rosa, CA
Posts: 251
Year: 2007
Coachwork: ICCORP
Chassis: CE300
Engine: DT466
Rated Cap: 16
Probably. Installing a hitch receiver today. So when that’s done I’ll track down the circuit. Determine if it’s an open or close circuit and fix it. Fairly easy to determine if the switch is open or closed when static or activated.
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Old 02-23-2019, 02:54 PM   #6
Skoolie
 
Join Date: Feb 2019
Location: Travel
Posts: 210
Year: 2007
Coachwork: Ic ce Navistar international
Chassis: Ce 300 school bus
Engine: 7.6L international ic ce 300 school bus
Yes there is a safety connection to back doors drops brakes from releasing it thinks does are open
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Old 02-23-2019, 05:09 PM   #7
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Join Date: Dec 2017
Location: Dawsonville, Ga.
Posts: 10,482
Year: 1999
Coachwork: Genesis
Chassis: International
Engine: DT466/3060
Rated Cap: 77
I'm surprised there isn't an audible warning that a door is "open". Surprising also that yours allows you to start the engine with an "open" door. Mine are all connected to the starter, open door, no turning the motor.
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Old 02-23-2019, 05:11 PM   #8
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Join Date: Aug 2018
Location: Santa Rosa, CA
Posts: 251
Year: 2007
Coachwork: ICCORP
Chassis: CE300
Engine: DT466
Rated Cap: 16
I have the audible warning on the doors. I thought I had it on the emergency exits.
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