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If I press brake pedal fast on 2018 gu 713 l hear burping sound coming from air tanks. Any ideas? 

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My Titan and cl will to that from time to time too. More when it's hot outside. 

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The Chevrolet C65 log truck will do that sometimes, we've determined it's the double check valve on that particular system. Same if you hook up a hose and use an air tool off of it.

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My superliner does it first 2-3 miles but gives warning in colder weather .

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There is a bulletin on this . Seems to only happen on the GU's even though it's the exact same set upon the cxu/chu. It's kinda a burping noise at the foot valve that vibrates the brake pedal in most cases.

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Mackpro what is the fix for this  my 2018 granite is doing this too

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The foot valve is not centered in the mounting bracket . When you push down on the brake pedal , the pedal hits the plunger which presses on the foot valve. When the foot valve is not centered the plunger pushes down more on one side than the other of the foot valve and a small amount of air shoots past the seals into the cab

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Thanks Mackpro is Mack going to fix this or is this a case of the squeaky wheel gets the grease

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On 7/1/2018 at 6:51 PM, mackcat12 said:

Thanks Mackpro is Mack going to fix this or is this a case of the squeaky wheel gets the grease

One year warranty on this issue. There's really not a official bulletin on this but I have some unofficial info from the higher ups that I can send you and explains it better. Message me for contact info and I can send it to you. 

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