Medium and Heavy Trucks

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Related Medium and Heavy Trucks Questions
Air system problem new compresser and air dryer air feeds
air system problem new compresser and air dryer air feeds into the main tank but will not feed into other tank … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
4,737 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
395 satisfied customers
I checked the wet tank for a check valve and it doesn't have
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 much of a problem… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
4,023 satisfied customers
Air builds to 80 psi then stops until i rev her up.
Air builds to 80 psi then stops until i rev her up … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
395 satisfied customers
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 have an international prostar vin BN195258 I'm having air
Hello i have an international prostar vin BN195258 I'm having air issues on my truck. Just couple days ago i had 30lbs of air pressure and we called out a tech on the road. They ended up replacing the… read more
Andy
Andy
truck /coach technician
Vocational, Technical or Trade School
207 satisfied customers
I just changed the purge valve in the air dryer and now
I just changed the purge valve in the air dryer and now can't build secondary pressure, what could be wrong? … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
395 satisfied customers
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
Expert
Expert
7,452 satisfied customers
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
Associates
395 satisfied customers
Truck Vin H72526 cummins ism air compressor part number..
Truck Vin H72526 cummins ism air compressor part number.. problem started a couple days ago..truck would build way too much pressure 140+ psi. I changed the governor out and it built and stayed perfec… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
395 satisfied customers
Looking for a diagram for air system on a 2005 Frieghtliner
looking for a diagram for air system on a 2005 Frieghtliner colimbia … read more
Don
Don
fleet superintendent
Vocational, Technical or Trade Scho
1,636 satisfied customers
2011 Peterbilt 320. Slow to build air pressure. Won't build
2011 Peterbilt 320. Slow to build air pressure. Won't build past 1oo psi at idle. Driving it builds air normally. @1500 rpm. it will build pressure but very slowly. No audible air leaks. By passed air… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
4,737 satisfied customers
1994 international 4900. we have been having severe problems
1994 international 4900. we have been having severe problems with the air freezing up on it and we want to bypass the air dryer. what are the ramifications of bypassing the unit? I would much rather s… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
4,023 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
Journeyman
Vocational, Technical or Trade Scho
2,873 satisfied customers
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
Toby
Toby
Vocational, Technical or Trade Scho
107 satisfied customers
I have an International 9900 with an AD-IP air dryer. The truck
I have an International 9900 with an AD-IP air dryer. The truck will not build air due to air constantly pumping out the purge valve. I have installed a new purge valve, new governor, new desiccant ca… read more
spankyjr1
spankyjr1
Journeyman
Vocational, Technical or Trade Scho
2,873 satisfied customers
I have a cat c7 in a freightliner m2. I replaced my air dryer
I have a cat c7 in a freightliner m2. I replaced my air dryer due to constant air leaking thru the purge valve. now the dryer spits- not at idle but while at rpm. I removed the purge valve, turbo valv… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,234 satisfied customers
I am working on a 1991 Pete with a L10. I just updated the
I am working on a 1991 Pete with a L10. I just updated the dryer with a AD-9 dryer. The dryer i took off i could not identify. It looked close and had 3 lines hooked up to it like the AD-9. The proble… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,740 satisfied customers
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Meet the Experts:

Daniel Wilson

Daniel Wilson

4,737 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

5,234 satisfied customers

I am ASE Master Truck Certified.

Wayne

Wayne

Journeyman

4,023 satisfied customers

worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling

Jeremy

Jeremy

Certified Truck/Bus Technician

2,740 satisfied customers

ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, Network Engineer specializing in CAN faults, Aftertertreatment, and vehicle communications

cumminsdr

cumminsdr

Mechanic

1,700 satisfied customers

All types of Cummins applications

Curtis B.

Curtis B.

Technician

1,571 satisfied customers

Technician turned service manager on multiple lines of trucks and engines, used in industry.

Chris (aka-Moose)

Chris (aka-Moose)

Technician

353 satisfied customers

24 years of experience diagnosing & repairing

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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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