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Old 06-30-2013, 09:38 AM   #1
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Brake light & pac brake

Does anyone know if the brake light is activated when the Pac brake is used?

Thanks, Bob
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Old 06-30-2013, 10:36 AM   #2
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Mine does.
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Old 06-30-2013, 10:46 AM   #3
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Depends on the coach mfgr's custom at the time of the build year
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Old 06-30-2013, 10:47 AM   #4
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My Itasca does.
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Old 06-30-2013, 10:47 AM   #5
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Our only activates the center brake light, the service brakes illuminate all of them.
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Old 06-30-2013, 10:55 AM   #6
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Many years of Freightliner chassis do activate the brake lights when the exhaust brake is active, use the brake lights to interrupt the cruise control and warn others that your slowing down. Chances are if you can turn the exhaust brake switch on and have the cruise operate then you have the type of set up that will turn on the lights.
Other chassis are wired so you can't have the cruise on when the exhaust brake switch is on.
If your brake lights and turn signals share a common bulb, you can test , the brake light / exhaust brake on the road. With your 4 way flashers on push the brake pedal , if the flasher stops , then you can test on the road, flashers on activate the exhaust brake , if the flashers stop. you know that the brake lights come on .
If someone with your exact make/ model /year of coach can't tell you then your stuck road testing with someone following and cell phones.
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Old 06-30-2013, 02:10 PM   #7
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Mine does. When I put my blinkers on they ring a bell. When I press the brake the bell stops. With my foot off the brake and the PAC brake kicks in, the blinker bell also stops. Telling you the brake light is on.
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Old 06-30-2013, 03:12 PM   #8
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Thanks for all the input. I should probably taken the time to state that I am installing a US gear controller and understand that IF the pacbrake activates the brake lights, then I will need to install a block diode of some type.
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Old 07-01-2013, 01:59 AM   #9
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I'm aware of others that had to do this , also heard of owners who got a big surprise when they didn't know about it. Best place to intercept the wire is at the brake light switch, should be 2 mounted to the foot valve , if you have air brakes , remove the " cold " wire from the switch and install the diode there.
I have all the wiring diagrams for my coach and can't figure out where the exhaust brake feeds power into the circuit, so I figure you can't get a place where your any more sure that you get that signal interrupted than the brake light switch it's self.
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