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Related Medium and Heavy Trucks Questions
I have a 2016 Freightliner Cascadia. The secondary air
I have a 2016 Freightliner Cascadia. The secondary air pressure is dropping with the depression of the service brake pedal. The secondary pressure only builds up to about 110 psi. I can hear a constan… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
Name is Toqeer and question I have is.. 2017 Freightliner
Hey My name is ***** ***** question I have is.. 2017 Freightliner cascadia DD15 purge air every 20 seconds, Can you please help me to understand what that could be? Air Dryer, Governor or something el… read more
Brent Goodnoe
Brent Goodnoe
4 satisfied customers
I have a 2007M2 Business class freight liner, it has a MBE
I have a 2007M2 Business class freight liner, it has a MBE 900–250. I replaced the compressor and the filter dryer. Started the truck And it felt pressure but would not purge, like a dummy I revved it… read more
Joe Green
Joe Green
66 satisfied customers
2014 KWT680 isx cm2350, I noticed lately the air pressure
2014 KWT680 isx cm2350, I noticed lately the air pressure when idle from the start it doesn't build up unless I rub up the engine close to 1500 rpm then the gauge niddle starts to climb, I did change … read more
Andrew G.
Andrew G.
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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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1998 Freightliner FL80 Cummins 8.3 will not build pressure
1998 Freightliner FL80 Cummins 8.3 will not build pressure past 60 PSI on the service side … read more
Joel Bos
Joel Bos
909 satisfied customers
My 2020 cascadia is loosing air in secondary tank but only
My 2020 cascadia is loosing air in secondary tank but only when driving have had truck in multiple shops can't find it doesn't leak while sitting … read more
Mikael
Mikael
Bachelor's Degree
150 satisfied customers
I have a 2015 freightliner sd114. After 15 minutes I lose
I have a 2015 freightliner sd114. After 15 minutes I lose about 60lbs of air. I have replaced the air dryer already. I can not hear or see any air leaking. Sprayed with soapy water. Any thoughts? Vin … read more
Andy
Andy
truck /coach technician
Vocational, Technical or Trade School
214 satisfied customers
I have a 2005 Freightliner M2. Has a Mercedes MBE 4000
I have a 2005 Freightliner M2. Has a Mercedes MBE 4000 engine. Air pressure will not go up past 70 psi on both gauges. Checked all over the truck can't find any substantial leaks anywhere. Hope the pr… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
570 satisfied customers
Have 1998 Freightliner want build up air past 50lbd have
Have 1998 Freightliner want build up air past 50lbd have replaced governor bypass air dryer pull valves out of head of compressor clean and they looked ok I took sopair and hook to red airline and hel… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
Name is will my primary air gauge gets up to around 60psi
Hey my name is ***** ***** primary air gauge gets up to around 60psi but my secondary is around 100 I drained the tanks already primary still got around 50-70 but then drops when I hit the brakes … read more
james Roberts
james Roberts
Maintenance assistant
Vocational, Technical or Trade School
3 satisfied customers
I have a 2004 freightliner columbia that started losing air
I have a 2004 freightliner columbia that started losing air pressure driving down the highway.Then once I parked it built up again and now it's losing pressure while I'm sitting.Any suggestions? … read more
Keiphun Sowell
Keiphun Sowell
Owner Brothers Restoration/Troubleshoot
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2,434 satisfied customers
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
6,062 satisfied customers
My 2015 Freightliner cascadia evolution have air pressure
My 2015 Freightliner cascadia evolution have air pressure problem ...so basically when i start my truck it build up pressure all the way to 135 psi(both gauges) then during driving slowly (when im app… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
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I have a 1998 school bus with a t444e in it. This morning my
i have a 1998 school bus with a t444e in it. This morning my brake pressure was slow to build. i drove it about 10 minutes and then stopped and it was idling. the air pressure dropped, but not all the… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
Air dryer started purging every minute and a half or so. No
Air dryer started purging every minute and a half or so. No loss in pressure. Swapped the air dryer and new governor. Started doing that I'm very cold weather. Still doing the same thing after new par… read more
Don
Don
fleet superintendent
Vocational, Technical or Trade Scho
1,636 satisfied customers
HAVE A 86' MC686FC MACK TRUCK. AIR BRAKE PRESSURE BUILDS
HAVE A 86' MC686FC MACK TRUCK. AIR BRAKE PRESSURE BUILDS ERRATICLY. BEFORE AIR PRESSURE STARTS TO BUILD AIR WILL SPUTTER 3 TIMES OUT OF SAFETY VALVE ON AIR DRYER,THEN AIR WILL BUILD.I HAVE REPLACED GO… read more
Don
Don
fleet superintendent
Vocational, Technical or Trade Scho
1,636 satisfied customers
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
spankyjr1
Retired
Vocational, Technical or Trade Scho
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Daniel Wilson

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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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