I've got a 2017 Silverado. While launching my boat yesterday my brakes almost quit working and I nearly rolled back into the lake. I came home and did some googling and found out this is happening to a bunch of people and there is a recall on the vacuum pump system that assists braking at low speeds, particularly in reverse. It'll pucker your butt when you are rolling down a boat ramp and your brakes don't work!

If you have a 2014-2018 GM vehicle, go see your dealer!

Date: September 6, 2019
NHTSA Recall Number: 9V645Recall
Manufacturer Recall Number: N192268490

Summary:
General Motors has decided that a defect which relates to motor vehicle safety exists in certain 2014-2018 model year Cadillac Escalade, Chevrolet Silverado, Chevrolet Suburban, Chevrolet Tahoe, GMC Sierra, and GMC Yukon vehicles. In some circumstances, these vehicle may have a condition in which the engine-mounted mechanical vacuum pump output may decrease over time, decreasing the amount of vacuum/power brake assist.

Wow, that would get your attention! Reminds me of launching the boat at Lake Castaic in Cali at the dam where the water was 300 feet deep. The lake was about 100' low when we were there. I recall driving down the ramp about a 1/4 mile to the water thinking I sure hope the brakes on this thing are good. It was spooky.

Thanks for the heads up Josh!

Yep, have had the same thing happen. I have a 2014 Silverado and plan on taking mine in next week for the recall.

Kind of scary when it happens!

Have anybody got a recall letter in the mail ?

I got a letter. Already had it done. Takes about 20 minutes once they get their hand on your truck. It is a computer issues and they uninstall and install a new program

Yep, got a 2014 LTZ Z71. Got the recall notice about a month ago. Taking it in soon.

I'm having a real hard time with this being a computer issue. I've launched my boat without issue a 100+ times in the last two years. Now all the sudden the breaks don't work when backing down a boat ramp? Clearly a part that was working is no longer working. So I'm supposed to take it in, let them change some computer code, then go see if my truck rolls into the lake this time?

Got a 18 and have not seen anything in the mail .

Letter right here on my desk for that recall, dated Sept 2019 will be taking mine in this week.

I had mine reprogrammed at the dealership on Thursday and the issue still persists. I am calling them this morning.

I have a 2015 GMC 2500 and checked as of the am and there is not a recall on it of any kind according to VIN number

The recall has nothing to do with vacuum pump supply , updated ( special policy , not recall) N182202780-01 (oct 11 , 2019) for loss/low vacuum supply from pump
covers for 10 yrs/ 150,000 miles. replaces vacuum pump and belt. however due to strike no parts are available at this time.. they will be regular ordered and
notifies customer when they arrive, ( I know I have 20 plus back ordered) for existing cases..
If on second /third apply pedal gets hard or on extended apply , its a vacuum pump... hope this helps..

Thanks for the heads up! I never got a notice, but have the same truck you do. I can imagine that's a scary feeling.

Here is the link for anyone that wants to check their VIN against any recalls.

GM/Chevy Recall Check

Thank you for this thread, I had my vacuum pump go out on my last Feb, about ran into someone at Squaw creek. I had it replaced out of pocket, just got off the phone with GMC they are sending me a reimbursement form to get my money back. Happened with 102,000 on the clock