Medium and Heavy Trucks

Have truck repair questions? Ask an Expert

Connect one-on-one with {0} who will answer your question

Related Medium and Heavy Trucks Questions
Working on a Van Hool bus. The customer came in wanting to
Working on a Van Hool bus. The customer came in wanting to replace the air compressor because the 2nd and 3rd air tank will not build past 80psi. I replaced the air compressor along with the air drier… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
2006 Volvo VN have an issue with the air system. Air builds
2006 Volvo VN have an issue with the air system. Air builds up fine, goes to 120 purges trailer supply is fine but nothing in the cab has any air supply. Air seat doesn't work, range selector on shift… read more
Gary A.
Gary A.
Associates in Diesel Technology and Business Management
6 satisfied customers
Air presures going from a litte more then 100 to 115 an to
Air presures going from a litte more then 100 to 115 an to 125 .. up and dow while driving not using brakes or anything … read more
BrentR718
BrentR718
13 satisfied customers
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
Expert
Expert
10,510 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
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 a truck in the shop that we have changed the
I have a truck in the shop that we have changed the thermistors on and we have evacuated and filled the system with the correct amount of Freon. to fill the system we had to jumper the clutch to make … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 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
Triage Tech/Shop Foreman
Associates
571 satisfied customers
KW T-660 2010 secondary air pressure gauge is reading 150
KW T-660 2010 secondary air pressure gauge is reading 150 psi while primary is at 110-115 as usual. I pumped brakes down to zero psi on primary and secondary gauge read about 50 psi. Is my secondary p… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
17,494 satisfied customers
I have a 2013 International ProStar with a maxxforce 13.
I have a 2013 International ProStar with a maxxforce 13. When I start the truck after bleeding the air off the night before the secondary tank fills as normal but the primary tank only fills to 30 PSI… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
571 satisfied customers
I have a 89 MCI 102 A3 bus, air pressure goes to 90 PSI or
I have a 89 MCI 102 A3 bus, air pressure goes to 90 PSI or 100, move very slowly to 110 it wont go to 125 PSL, I replaced the foot valve, still the same, can you help? … read more
Curtis B.
Curtis B.
Technician
Associate Degree
1,947 satisfied customers
I have a 2007 Freightliner M2 and the air pressure was fluctuating
I have a 2007 Freightliner M2 and the air pressure was fluctuating between 100 psi and 105 psi. when it went below 100 psi, the brake light and warning buzzer came on. I replaced the governor and now … read more
spankyjr1
spankyjr1
Retired
Vocational, Technical or Trade Scho
420 satisfied customers
we have a 2007 pete having trouble with air ride suspension
we have a 2007 pete having trouble with air ride suspension when step on gas pedal load gauqe goes down 15 lbs when step on break load gauge goes up 15 lbs on the truck frees it self up and rolls easy… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,756 satisfied customers
I have an 09 Volvo 670 with the D13 Volvo engine. When parked
I have an 09 Volvo 670 with the D13 Volvo engine. When parked it builds air when it gets down to only 110 to 115 #. Some times it works right and goes to 100#. When driving it goes down to 105 to 110 … read more
spankyjr1
spankyjr1
Retired
Vocational, Technical or Trade Scho
420 satisfied customers
Hi , I have a 05 M2 with MB engine. Had an air leak coming
Hi , I have a 05 M2 with MB engine. Had an air leak coming from the purge valve seal around the snap ring. Replaced O-ring and reassembled. Now air pressure builds quickly in the secondary tank, but n… read more
JANECZFJ
JANECZFJ
158 satisfied customers
hi mate,ive got a customer with a 2011 fuso heavy with air
hi mate,ive got a customer with a 2011 fuso heavy with air pressure problems.The primary tank builds up to 6bar but the secondary tank will not build up pressure.there is no external air leaks on the … read more
Steve
Steve
Self Employed
High School or GED
30 satisfied customers
I have a 2003 International 9200i tandem semi tractor. When
I have a 2003 International 9200i tandem semi tractor. When the truck is running it loses about 5psi per minute secondary air and the air compressor will not load until the secondary air reaches appor… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
17,494 satisfied customers
i have a 07 western star 4900fa.i have a problem with the air
i have a 07 western star 4900fa.i have a problem with the air ride cab.i release the brakes the air valve loses air,but does not exhaust through the valve… read more
JANECZFJ
JANECZFJ
158 satisfied customers
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.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Daniel Wilson

Daniel Wilson

6,062 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

5,353 satisfied customers

I am ASE Master Truck Certified.

Wayne

Wayne

Journeyman

17,494 satisfied customers

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

Jeremy

Jeremy

Certified Truck/Bus Technician

2,756 satisfied customers

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

Curtis B.

Curtis B.

Technician

1,947 satisfied customers

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

cumminsdr

cumminsdr

Mechanic

1,886 satisfied customers

All types of Cummins applications

Chris (aka-Moose)

Chris (aka-Moose)

Technician

641 satisfied customers

24 years of experience diagnosing & repairing

< Previous | Next >

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.

Show MoreShow Less

Ask Your Question

x