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Assuming you're referring to the trailer service air supply line in an air brake equipped combination, initially, nothing - you won't have trailer brakes and you'll notice a rapid loss of air pressure in the primary system when you apply the brake pedal (if you use the Johnson bar, you'll notice a rapid loss of pressure in the secondary air system). The service (blue) line only has air going through it when the brake valve or Johnson bar is applied - it's the emergency (red) line which is continually charged to keep the spring brakes released.

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2015-02-10 01:12:40
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2015-02-10 18:21:00

It is most likely a sporatic or emissions related issue. You should has the computer scanned to determine if it is something that can cause damage to you engine.

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Q: What happens if your service line comes off while driving?
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