[NicoR6321]

I have a 2021 Blazer 2LT with the 3.6L and AWD options fitted on it. I took delivery in November '21 and noticed a couple things in the few months since owning that I wanted to get some opinions on here about to know if its a common occurrence/normal or something worth bringing up when I take to the dealership later this month to get a window scratch fixed. Here's what I've noticed:

• It's only happened to me a couple of times and usually when I apply moderate to heavy force on my brake pedal, but there will be a grinding noise that comes from the wheels while coming to a stop. I don't notice any visible gouges or scratches to the rotors but have heard from one other person that their brake pads were faulty from the factory and he had to go them fixed at a dealer. Has anyone else had this problem? Is this more common than I think?
• for the AWD models, I know that these Blazers will remember if your are in X2 or X4 mode whenever you turn off and restart the vehicle, but whenever I'm in sport, trail, or tow mode and shut the vehicle off, it defaults back to X2 mode. is this true for everyone else?
• I know that almost all (if not all) new vehicles today have an electronically controlled throttle, but the tachometer seems to lag a bit whenever I'm accelerating quickly. For example, if im in a highway gear coasting at around 2000 rpm and trying to pass someone, I accelerate pretty quickly and can feel/hear the engine accelerating but the needle on the tachometer wont budge from 2000 rpm until the engine gets to 3000 rpm and then it'll suddenly jerk over to reflect the correct rpms. Is this common for these vehicles? Does anyone else notice the same thing?
• I don't have the Driver confidence and convenience package on my vehicle or whichever package it is that upgrades you to a BOSE sound system throughout the car. The non-bose factory speakers in the door panels seem to suck and have a lot of static noise whenever a song with mid to high level bass is played. is this just poor quality speakers or is mine possibly faulty?

 

[NicoR6321]

Update on my original post now that I've put a couple more miles on my Blazer and it's been broken in a little more:

• brake noise issue has been resolved. I took to the dealer that sold me the vehicle and explained what was happening. they were able to fix it under the manufacturer warranty and I have not noticed the issue since. What I was told by the techs and believe myself is that the brake pad material put on the vehicle from the factory was the source of the problem because of it being a low quality part.
• This issue has been answered y the multiple posts on here and I now know this is a normal occurrence.
• When accelerating and shifting between gears, I do notice that it is bit smoother and the tach does not lag as much. I agree with BlackDragon though tat the transmission lags with the tach and that's just one of those things you cant really do much about with the stock configuration.
• This issue i haven't noticed recently and it hasn't bothered me since. Perhaps it was just me being a little too picky? I don't know audio systems and components too well, but I have heard before that there is an initial break-in procedure with new sound systems before they sound their best. Maybe this was the case?

Regardless, thanks to all for their input!