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I have an 04 Mack cv713 the primary air system keeps
I have an 04 Mack cv713 the primary air system keeps building air well past 140 but the secondary only builds up to 130 and takes about 20 minutes to build that much I've replaced the governor and the… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
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I'm having this same issue. The problem with the answer is
I'm having this same issue. The problem with the answer is that the secondary port on the air dryer has no air to supply the tank … read more
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Vocational, Technical or Trade Scho
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My 1988 flc freight liner tractor suddenly won't build air
My 1988 flc freight liner tractor suddenly won't build air in brake system … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
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My secondary air gauge isn't building pressure. 2015
I checked the hoses under the hood and no air is flowing but the primary is filling normal … read more
Daniel Wilson
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I checked the wet tank for a check valve and it doesn't have
Second opinion] Hello I checked the wet tank for a check valve and it doesn't have one and I didn't see any sign of one on the dryer from the dryer to the compressor or the dryer to the wet tank how m… read more
roybelding
roybelding
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I have a 2005 Freightliner Columbia not building air
I have a 2005 Freightliner Columbia not building air pressure to the second tank also. I have put in a new compressor, governor, and check valve. Don't find any leaks anywhere... … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
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2005 mack granite e7 wont build air. I installed new
2005 mack granite e7 wont build air. I installed new compressor, new govner, new air dryer. Will not build air at idle. Air lines are not kinked. No regulators going into tanks. … read more
Bradey V
Bradey V
Certificate
I just installed an air dryer on a 2001 century class
I just installed an air dryer on a 2001 century class Freightliner. In front of the air tank but it will only build up air on secondary side, what could be wrong … read more
Daniel Wilson
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Auto Mechanics 1&2/diesel mech
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The air brake pressure on my 1998 Freightliner is slow to
The air brake pressure on my 1998 Freightliner is slow to build and when I apply the brake while the engine is running, the air pressure drops to 60psi within 15 pedal pumps. Too fast. I don't hear an… read more
roybelding
roybelding
Shop Foreman Freightliner trucks
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I'm having with air pressure on a 379 Pete with vin #
I'm having with air pressure on a 379 Pete with vin # ***************** it's only building 90 psi on primary side no air leaks and I have tried a new compressor, still 90 psi no secondary at all no ai… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
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461 satisfied customers
I have a air pressure problem on my Mac truck. It does not
I have a air pressure problem on my Mac truck. It does not generate enough air pressure on the primary side there is a 40 pound difference between the primary and secondary and when we work the truck … read more
Mike Mcmillan
Mike Mcmillan
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Associates
461 satisfied customers
Freightliner Columbia 2010 with Detroit Series 60 Air drier
Freightliner Columbia 2010 with Detroit Series 60 Air drier assembly and air governor have both been replaced twice. Both primary and secondary air gauges going to 150 psi Air from air drier purges fo… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
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Have a 2004 Coumbia day cab changed air dryer govener and
have a 2004 Coumbia day cab changed air dryer govener and compressor both gauges build to 120 bottom gauge loosing lot of preasure when air dryer pops of … read more
roybelding
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Primary air tank no air Freightliner Columbia. Freightliner
air compressor and complete air dryer replace 2 months secondary air tank fill up but not primary air dryer is mounted on deriver side air tank… read more
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My low air pressure warning signal will not cut off even
My low air pressure warning signal will not cut off even though I have plenty of air pressure in my Kenworth T2000… read more
Daniel Wilson
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My 04 freightliner isn't building secondary air. Its a 3 tank
My 04 freightliner isn't building secondary air. Its a 3 tank system with an automatic trans… read more
spankyjr1
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I have a 2009 T800 KW day cab with isx cummins Is it possable
I have a 2009 T800 KW day cab with isx cummins Is it possable to get a diagram of the compressed air system… read more
Andy
Andy
truck /coach technician
Vocational, Technical or Trade School
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Freightliner M2 business class air pressure wont pass 80ps
Freightliner M2 business class.... air pressure wont pass 80psi at idle with new compressor, new governor, air dryer , rear brake chamber...if I rev the truck it wld build and purge ... but after the … read more
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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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