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Vacuum pump & mechanics

Adam Leinss
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Blue17 Enthusiast

Blue17

Posted
Posted

EVERY thing on a vehicle is a safety item these days. they are all connected in some way. Fact is mechanical things break. nothing in this world is made so perfect that it cant break. just because something broke doesn't mean issue a recall on it right away. If the OEM's were to be held by that standard no one could ever afford to buy a vehicle and all the companies would go out of business. Yes these truck are expensive no doubt. and yes the OEM's need to constantly thrive to build a better product. but a recall doesn't need to be issued every time a part built by humans fail. Okay let the flaming begin

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300 Blackout
300 Blackout

That depends if oil was found in your vacuum line. If it was then the recommendation is to replace the additional parts of the braking system. If no oil was found in the line and they don’t suspect oi

newdude
newdude

AFM is why. It allowed them to change the AFM so it runs more with low/no load. When you drop 4 cylinders, you drop your vacuum supply. Helps for added brake assist to increase pedal feel over the

montytx
montytx

This happened to me today. Ordering a new pump. I can tell you this, you have to push down really hard to bring these to a stop. I assume they included them in the engine because they drop to 4 cyl.

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bgmartin New Member

bgmartin

Posted
Posted

I'm new to the forum, not sure if my post sparked the comment about safety and recall. I was just sharing so that others may know if they get the same issue. Chev dealership was great, fixed it in a couple of hours under warranty.

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Spurshot Senior Enthusiast

Spurshot

Posted
Posted

I think the point is that reporting the issue contributes to a national database of issues. NHTSA will determine whether it is a safety issue, based on the consequences of the failure and the frequency of failure. It's kinda like your doctor reporting flu in his patients to CDC.

Boardmember Senior Enthusiast

Boardmember

Posted
Posted

I'll tell you the safety issue. Taking it to the dealer four times for this exact issue. Yes I was able to make it stop. Unexpected, sudden occurrence. Significant effort, not nominal. Sometimes in much less than ideal conditions (read: crowded parking lot in rain, positioning to park on an incline...)

 

I wanted it fixed. Dealer ultimately traded me out - '16 for a '16 - special consideration, but no specific allowance for my concern. As in, the next guy could have gotten the same deal. Yes I lost money even as I realize my vehicle isn't an investment. I couldn't stand the risk - especially as I couldn't get a diagnosis.

 

Now, it's a recognized issue. I'm glad for y'all.

qwank Senior Enthusiast

qwank

Posted
Posted

There's a service bulletin for this issue now, GM wants you to replace the pump, booster, master cylinder and the line from the pump to the booster. The pump is definitely a redesign, but I didn't notice anything different with the rest of the parts.

  • 3 months later...
Consumer Advocates New Member

Consumer Advocates

Posted
Posted

Class action attorneys are currently investigating this issue and would like to hear more about your experience. Did you notice it only at low speeds? Did the brake pedal become hard or difficult to press?

 

You can contact us via email at: [email protected] or visit: https://www.consumeradlaw.com/gmhardbrakepedal

 

There is absolutely no cost or obligation on your part. If you would prefer to reach out by phone, we can be reached at (855) 425-2775. 

wmgeorge64 Enthusiast

wmgeorge64

Posted
Posted (edited)

I was under mistaken idea that since these trucks have high pressure direct injection fuel systems that engine vacuum was not available?

Edited by wmgeorge64
Artie61 Enthusiast

Artie61

Posted
Posted

I tell the wife to take my truck all the time this may be a concern to think about !

 

I wonder why this would not throw a code seems like a another sensor is needed here .

Paintor Enthusiast

Paintor

Posted
Posted
On 11/13/2016 at 9:29 PM, mkward72 said:

 

I fail to see is why it's a safety issue. The breaking system Never failed. You just have to press the pedal harder. When the power steering pump goes out it's a safety issue to? You don't lose steering just the assistance to turn the wheel easier.

When there is a low voltage issue.....you DO lose steering ......there are stories on here of people having the steering wheel ripped from their hands and loss of ability to steer. So far been bad grounds/dead cells is batteries/too much resistance in battery cables.

Paintor Enthusiast

Paintor

Posted
Posted
6 hours ago, Artie61 said:

I tell the wife to take my truck all the time this may be a concern to think about !

 

I wonder why this would not throw a code seems like a another sensor is needed here .

There is a Vacuum sensor on the brake booster. When low vacuum is detected, it disables AFM....it should flash on the dash that you are SCREWED if the computer detects low vacuum.....I dont think it would be hard for someone to design an aftermarket Vacuum gauge and tie into that sensor.

 

Lots of us would buy them. 

2016 Sierra Owner Senior Enthusiast

2016 Sierra Owner

Posted
Posted
10 hours ago, Paintor said:

When there is a low voltage issue.....you DO lose steering ......there are stories on here of people having the steering wheel ripped from their hands and loss of ability to steer. So far been bad grounds/dead cells is batteries/too much resistance in battery cables.

So your telling me that GM put a vehicle on the road that relies on the steering system to be powered by electricity at all times to maintain steering control of the vehicle? That's BS!

 

KARNUT Senior Enthusiast

KARNUT

Posted
Posted
So your telling me that GM put a vehicle on the road that relies on the steering system to be powered by electricity at all times to maintain steering control of the vehicle? That's BS!
 
Not BS, my son got rid of a 15 Tahoe that did just that. Along with blinking dash lights and head lights. She had her daughter record the event and showed the dealer. Funny how they had a two week wait for a fix at the dealership. The problem was never fixed, he took at 15K hit on the POS.



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  • 2 months later...
Chris j New Member

Chris j

Posted
Posted

This happend to me today first my ac compressor shells now this i reported this i urge everyone to report this it was so sudden if i was pulling a trailer i would have most likely wrecked

gone_fishing Enthusiast

gone_fishing

Posted
Posted (edited)
12 hours ago, Chris j said:

This happend to me today first my ac compressor shells now this i reported this i urge everyone to report this it was so sudden if i was pulling a trailer i would have most likely wrecked

Did your vacuum pump go out?

Edited by gone_fishing

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