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Discussion Starter · #1 ·
  • GM Recall #:
    [*]N182167900

  • NHTSA #
    [*]AWAITING#

  • Date Issued:
    [*]Aug 30, 2018


Recall Title:

Trapped Hydrogen Gas Rear Brakes
Recall Description:

General Motors has decided that a defect which relates to motor vehicle safety exists in certain 2018–2019 model year GMC Terrain vehicles; 2018 model year Chevrolet Malibu vehicles; 2018–2019 model year Chevrolet Cruze, Equinox, Volt, Impala, and Bolt vehicles; 2018–2019 model year Buick Lacrosse and Regal vehicles; and 2018–2019 model year Cadillac XTS vehicles. In a small number of these vehicles, the rear-brake caliper pistons may contain trapped hydrogen gas that could be released into the vehicle’s brake system.
Safety Risk Description:

If gas is present in the brake system, rear-brake performance may be reduced, increasing the risk of a crash.
Repair Description:

Dealers will “bleed” the brake system to remove any gas from the rear brake system free of charge.

 

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Discussion Starter · #2 ·
From the MyChevrolet site:
This could happen for a number of different reasons:GM works to quickly identify affected vehicles and notify owners. Once GM has identified the affected vehicles, those VINs are loaded onto this site. This process can take several days, but in rare cases it may take longer. Even if your vehicle doesn't appear here, please check this website at a later date if you believe your vehicle may be involved in a recently announced recall. To determine if your vehicle is involved in a recall, type your VIN in the field below. Once entered, any recall repairs that have not been completed on your vehicle will be displayed. GM will notify all customers of affected vehicles in writing within 60 days of the recall announcement. Recalls are issued by VIN and may not include every vehicle manufactured within a model year. Your vehicle could have been manufactured at a different time, in a different manufacturing facility or using different parts than those involved in the announced recalls.If your vehicle has already been repaired at a Certified Service Dealer or Saab Official Service Center, the recall will not display. This website only displays recalls and/or programs for your vehicle in which repairs have not been completed.
 

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Hydrogen gas. HHMMMMMMM.

No mention of how hydrogen gas gets in there in the first place. And if it got there in the first place. And bleeding the brakes to rid the system of hydrogen. Wouldn't it be possible to have a re occurence?
 

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Hydrogen gas. HHMMMMMMM.

No mention of how hydrogen gas gets in there in the first place. And if it got there in the first place. And bleeding the brakes to rid the system of hydrogen. Wouldn't it be possible to have a re occurence?
The hydrogen outgassing had something to do with the casting process of the pistons.
The supplier of same triggered the recall but the corporation could not narrow down specific cars affected, so, they recalled all cars using that suppliers component during a specified build date period.

The proceedure is just simple flush/bleed but the recall caused a nationwide DOT 4 shortage last week.

Rob
 

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The hydrogen outgassing had something to do with the casting process of the pistons.
The supplier of same triggered the recall but the corporation could not narrow down specific cars affected, so, they recalled all cars using that suppliers component during a specified build date period.

The proceedure is just simple flush/bleed but the recall caused a nationwide DOT 4 shortage last week.



Rob
Recurrence: unlikely, the outgas event takes place (as reported) within a few days after final machining/assembly.
Most likely, the event occured prior to initial assembly......GM (wisely) is known for being cautious ever since the ignition key thing.
 

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Discussion Starter · #6 ·
I understand Mercedes has the same issue with some GLC/GLE models. I should have put that in the original post-GM is not alone.
 

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Discussion Starter · #7 ·
The hydrogen outgassing had something to do with the casting process of the pistons.
The supplier of same triggered the recall but the corporation could not narrow down specific cars affected, so, they recalled all cars using that suppliers component during a specified build date period.

The proceedure is just simple flush/bleed but the recall caused a nationwide DOT 4 shortage last week.

Rob
How did the recall cause a Dot 4 shortage so quickly?
 

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How did the recall cause a Dot 4 shortage so quickly?
Well, consider this: There is a specific amount of DOT4 produced on a daily basis.....enough to satisfy the needs of all users per day. No point in making too much...it'll just sit on a shelf.
All of a sudden, every affected car dealer increases their inventory of fluid because they know a abnormally highnumber of fluid flushes will be showing up.
The producers were not, nor could they have been prepared for, a sales onslought of brake fluid......the pipeline dried out within three days.
Because of this, GM provided to dealers the aftermarket fluid suppliers that met GM's specification and they authorized the use of the aftermarket part numbers.

Parts stores, for the most part, were able to take up the slack with sparatic shortages reported.

Same thing happens when the media reports a slowdown in foreign oil production.......everybody goes and fills up, causing shortages and price hikes in an effort to slow down the usage.

Rob
 

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The hydrogen outgassing had something to do with the casting process of the pistons.
The supplier of same triggered the recall but the corporation could not narrow down specific cars affected, so, they recalled all cars using that suppliers component during a specified build date period.

The proceedure is just simple flush/bleed but the recall caused a nationwide DOT 4 shortage last week.

Rob
Ok so how does a gas from the Manufacturing of pistons get into the brake system?

Sent from my SM-G965U using Tapatalk
 

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Ok so how does a gas from the Manufacturing of pistons get into the brake system?

Sent from my SM-G965U using Tapatalk
Sounds like they must be using some type of hydrogen gas and building some type of plastic piston now. Something along those lines.

Doesn't sound like metal is used anymore.

While @Robby explains it pretty clear. I"m still now sure how the leakage occurs.
 

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Hydrogen is used in the manufacture of cast iron. I'm not implying I am a metalergist......just relaying info as given to me.
Going further, and repeating the same source, argon gas follows and is supposed to clear the hydrogen prior to the cooling process.

It is believed the argon was introduced at the wrong time....meaning the casting was still liquid but too cool.

Rob
 
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