Hello, I have a 2024 2LT, HTC stingray and love the car. So far I have 20,000 miles on it. I just saw the bulletin on fixing this issue and appreciate seeing the Bulletin # 17-NA-040 being posted.
thanks
Dan

 

Welcome and good luck with the repair.

 

Welcome!

 

Welcome! Happy Holiday!

I would ask your questions sections!

 

Welcome aboard Dan!!

 

Welcome to the forum and post some pics of your ride!!!

 

Welcome!!

 

Moving you to get more assistance in appropriate section

 

Welcome in

 

Welcome, mine with 5500 miles squeak after washing sometime and occasionally in this cold weather. I just do some hard stops and it goes away.

 

Co-pilot AI chat gives a summary, but can not post the actual bulletin.
Basically, clean, lube, and rebed the pads.
Good luck.

 

Here is a summary as good as posting the whole doc.

TSB 17-NA-040 PDF

A service bulletin that addresses brake squeal or squeak noise intermittently occurring on initial brake applies for several GM vehicles, including Buick, Cadillac, and Chevrolet models. The bulletin details the conditions and corrective procedures, which involve applying copper paste to specific areas of the brake pads and components. It includes instructions, images, and diagrams illustrating the correct application of copper paste. Additionally, parts and warranty information are provided for the necessary repairs.

Recall even with the C7 seeing posts where the dealer performed and the "squeal" came back. It's a Band-Aid that GM will pay to have the dealer do BUT it's NOT solving the basic issue. That is a thin, microscopic ununiform brake pad material is needed on the rotors! Especially with performance brakes they need to be bedded (GM calls burnishing.) Can look in the owner's manual under Tracking.

GM recommends many consecutive hard brake applications FOR BURNISHING from 60 mph to 10 mph NOT stopping. Right after a 1 minute cooldown (GM doesn't say why but that allows the brake pad material to start to bond with the rotor so it is not wiped off with subsequent hard braking -never stopping.) After their recommended ~50 hard braking cycles, with 1 minute cooldown between WITHOUT EVERY STOPPING continue to drive ~10 miles to let the pad material fully bond with the rotors.

GM will NOT pay the dealer to do that nor will the dealer as one reason the have to find a place to do that safely! I don't Track and have done a modified procedure on several Corvettes. About 10/12 hard braking (about ~0.8 "g") to ~10 mph and without stopping with a 1 minute cooldown (1 mile at 60 mph) between. Then without stopping when the 10 to 12 stops are completed drive ~5 miles without stopping to allow the pad material to fully bond. STILL HAVE TO FIND A SAFE PLACE TO DO THAT!

If that pad material is not uniform you get stick/slip friction and high frequency pad vibration that causes squeal especially on light slow speed stops. Also with performance pads it's important to periodically apply the brakes aggressively to maintain the uniform layer on the rotors. I do it at least once every day when i slow from a ~70 mph traffic on a 4 lane highway as I enter our 25 mph limit rural road. Folks behind don't have to slow for me as I turn and it's FUN!


Note I use Z-Mode and the DCT will automatically downshift several gears, rev matching each. Great sound!

 

Mine (23 non-z51 with about 9000 miles on it), squeaks on initial drive off for the 1st one or two applications of the brakes. Then it's good until the next morning. This started this winter once it started getting cold. Did not do this the past 2 winters.

 

Fine a safe road (when above ~60F) where you can make 5 or 6 aggressive braking (~0.8 "g") efforts and have 1 minute cooldown between and ~ 5 minutes driving after NEVER stopping. Cheap to do and you should get a uniform pad material on the rotors. You probably are experiencing slip/stick friction which is worse when cold. That causes pad vibration and squeal on moderate brake pressure slow speed stops. You can check out "burnishing" in the owner's manual under tracking (or Google brake bedding as most refer to it.) Note for Tracking where you want to get performance brakes up to max Tracking temps they call for ~50 such aggressive braking cycles, 1 minute cooldown between and 10 mile drive all without ever stopping! Most Tracks won't even let you do that and finding a safe place on the street almost impossible. BUT 5 or 6 hard breaking and 5 mile cooldown after not that hard in most places.

You should also brake aggressively frequently to maintain that layer of uniform pad material. I do about every time i drive- it's fun!

 

Mine squeak most cool mornings for a few stops and then its done, although recently I cannot recall hearing it lately. I doubt I will ever mess with it to be honest, I did that on a Cadillac years ago and it was a waste of time

 

True. As the weather cooled, mine started squeaking as I backed out of the garage. Don't hear it once I start driving.