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Old 04-18-2019, 10:45 AM   #1
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Parking Brake Lockout

I have a 2007 IC CE300 with airbrakes. For the child/school bus security issues, my bus has a parking brake override instead of a no engine start.

If a lift gate door is open or something else, the engine starts fine but the parking brake does not release.

I have been caught several times not able to move the bus - all with different areas of lockout activation.

I would like to disable it all together. Does anyone know the quick an easy trick to bypassing the security lockout on the parking brake release mechanism? I am hoping itís on the actual module in the dash, not at various control valves under the bus.

Thanks...
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Old 04-22-2019, 07:34 PM   #2
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Bumping this for any help. I have learned that itís officially called a ďPark Brake interlockĒ. I have also tentatively learned that itís programmed into the BCM but that itís locked out for reprogramming - although there should be a bypass that can be installed unless itís on a CAN bus but I donít believe that to be the case. I also find it questionable to be on the BCM because the interlock was not mandated until sometime after 2009. .

Currently the bus is dead - well it starts fine, it just wonít move.

Any help is appreciated.
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Old 04-22-2019, 08:20 PM   #3
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I wonder if this system works similar to ignition lockouts, any open door would lock it out. What about removing or bypassing the system either with disconnected wires, or connecting the wires to fool the module into thinking the switches are closed as they should be. Some systems look for "Circuit complete" to work, while others look for "no circuit".
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Old 04-22-2019, 08:32 PM   #4
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If I could locate the module that would be ideal. When I attempt to trace it back, the signal leads through at least five different wires. Iíve tried continuity tests and a tone generator. Iíve got a call into international to see what they say but they respond like frozen molasses.
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Old 04-23-2019, 01:01 PM   #5
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So I got this service bulletin for installing a Parking Brake Interlock. But removing it and all is not clear as to what parts are needed.

Any comments out there on this one? A mobile mechanic in the SF Bay area is $190/hr plus $3.40/mile. So for me this is looking like an $800-$1000 job for a mobile tech. I'd rather spend that money on the conversion.

Can anyone make sense out of of this document?

SKM_C25819042309120.pdf
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Old 04-23-2019, 03:43 PM   #6
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Problem resolved.

There were two air solenoid valves in the engine bay that connect to the parking brake valve and the air source. One of them is controlled by an electronic solenoid which is connected to the safety interlock.

We removed the interlock solenoids and voila!

Parking brake now functions properly.
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Old 04-23-2019, 03:44 PM   #7
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well that saved you a mobile mechanic visit. more money for the conversion. glad you got it figured out.
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Old 04-26-2019, 07:01 PM   #8
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Pizote, I’m running into the same issues. 2002 Thomas 3800. Just bypassed the ignition interlock and now the bus starts but now I can’t get the air brakes to release. Any way you could go a little more in depth on the air brake interlock removal?
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Old 04-26-2019, 07:08 PM   #9
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In the picture with the brass valve, there were two of them. I removed one of them and connected the two hoses together.

There is also a link to a service bulletin for installing the interlock on busses they did not come with one from the factory.

IMG_0399.jpgIMG_0400.jpg
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Old 04-26-2019, 07:44 PM   #10
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Did they have any wires running to the fuse panel with other relays or anything?
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