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Old 05-24-2020, 03:31 PM   #1
Join Date: May 2018
Location: Hager City WI
Posts: 34
Year: 1996
Chassis: International 3800
Engine: DT 466 Mechanical spicer 6+1. & 5.9 Cummins
Rated Cap: 65
Parking brake wonít release

I have a 2005 CE300 with hydro brakes and the parking brake will not release... has the Dt466 and Alison 2000 transmission. Any ideas?
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Old 06-03-2020, 12:02 PM   #2
Bus Nut
Join Date: Jan 2020
Location: Wild Wild West
Posts: 435
Year: 1999
Coachwork: Blue Bird
Chassis: TC RE
Engine: 8.3 Cummins MD3060
Rated Cap: 84
Any emergency doors or hatches open? Have you been trying to eliminate wiring? The newer busses are equipped with interlock systems that set off alarms and/or will not start or release brakes if any doors or hatches are open. Likewise, if you try to circumvent these systems it can cause the same result.
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Old 07-03-2020, 12:59 AM   #3
PeteinSF's Avatar
Join Date: Aug 2018
Location: San Francisco
Posts: 124
Year: 2006
Coachwork: IC
Chassis: IC FE 9 Window
Engine: DT466E
Rated Cap: 29850
If you have a wheelchair lift model, the outside door must be fully latched to disengage the parking brake. There is a micro switch in the lock receiver. No alarm will sound (like the roof exits do) just no brake release.

This system cuts off the pressurized air supply to the yellow plunger with two solenoid valves under the hood near to top of the firewall (or under the floor in my case).

Good luck.
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