Primary Overpressure

Topic 17426 | Page 1

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A-Ro's Comment
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Got into truck primary psi is pass 150psi actually right dwn the middle pass the red warning light. It steady beeps but wont lose the pressure on primary line. My secondary lines operates normally lose and rebuild air. When i push in both brakes primary psi wont lose any air stays pass the red warning light while secondary loses the psi and rebuild psi. Can anyone help me out on that

Kevin H.'s Comment
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Sounds like you should get a mechanic to check it out.

Kevin H.'s Comment
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...are you in a really cold place? Could be something frozen that will go away when it warms up. I don't know what the rules say, but I would think that as long as it's maintaining pressure you could drive.

Rick S.'s Comment
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...are you in a really cold place? Could be something frozen that will go away when it warms up. I don't know what the rules say, but I would think that as long as it's maintaining pressure you could drive.

^^^^ this.

Sounds like a valve is iced over. Which is why we DRAIN OUR TANKS DAILY (even if they have auto-drains), and add de-icer if the system allows.

I'd call ROAD SERVICE and/or SAFETY on this.

Do a "Pre-Trip Air Brake Check" - fan the brake until the alarm and TPV pop out. If the tank isn't supplying air to the brake system (ie: doesn't drop pressure) than the truck FAILS the Air Brake Test and would be put OOS if an inspector were to see this. Which pretty much makes the truck UNSAFE TO DRIVE. If the tank doesn't lose pressure when you apply the brakes - you may not even get an alarm or pop the tractor protection valve (though the alarm/protection system is supposed to work independently for each tank).

Long time ago - trucks only had one tank. But if it HAS TWO - they both have to be WORKING.

FMCSA regs require the tanks to be able to withstand 500 PSI - so I don't think 150PSI is going to blow up on you.

I (personally) wouldn't drive it any further than someplace I could get it checked out (if even that far). If the tank isn't discharging, and the other side of the system has a failure - you have ZERO BRAKES.

Rick

CSA:

Compliance, Safety, Accountability (CSA)

The CSA is a Federal Motor Carrier Safety Administration (FMCSA) initiative to improve large truck and bus safety and ultimately reduce crashes, injuries, and fatalities that are related to commercial motor vehicle

FMCSA:

Federal Motor Carrier Safety Administration

The FMCSA was established within the Department of Transportation on January 1, 2000. Their primary mission is to prevent commercial motor vehicle-related fatalities and injuries.

What Does The FMCSA Do?

  • Commercial Drivers' Licenses
  • Data and Analysis
  • Regulatory Compliance and Enforcement
  • Research and Technology
  • Safety Assistance
  • Support and Information Sharing

Fm:

Dispatcher, Fleet Manager, Driver Manager

The primary person a driver communicates with at his/her company. A dispatcher can play many roles, depending on the company's structure. Dispatchers may assign freight, file requests for home time, relay messages between the driver and management, inform customer service of any delays, change appointment times, and report information to the load planners.

OOS:

When a violation by either a driver or company is confirmed, an out-of-service order removes either the driver or the vehicle from the roadway until the violation is corrected.

A-Ro's Comment
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I did brake dwn test and it will not lose any air in primary line it stays where its at. So im just gne call a tech out. Im in Houston texas so its not really that cold compared to other states u know so....

Rick S.'s Comment
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I did brake dwn test and it will not lose any air in primary line it stays where its at. So im just gne call a tech out. Im in Houston texas so its not really that cold compared to other states u know so....

Bad valve then. Would likely still be safe to drive - but legally, it's an OOS Defect.

Rick

OOS:

When a violation by either a driver or company is confirmed, an out-of-service order removes either the driver or the vehicle from the roadway until the violation is corrected.

murderspolywog's Comment
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Have you tried pulling the drain valve? If you can drain the primary tank all the way and refill this will tell you 2 things if it's a stuck valve or a bad sensor. if it is stuck it may become unstuck if you relive all the pressure. But ether way I would say you are OOS untill it is fixed.

OOS:

When a violation by either a driver or company is confirmed, an out-of-service order removes either the driver or the vehicle from the roadway until the violation is corrected.

Rick S.'s Comment
member avatar

Enquiring minds want to know.

Was it a valve or a bad sender/sensor?

Rick

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