Jump to content

2019 GMC Sierra AT4 Warped Rotors

Mark Gilkes
 Share

Recommended Posts

Mark Gilkes New Member

Mark Gilkes

Posted
Posted

Greetings,

I have a GMC AT4 with 28K miles on it.  I noticed a pulsating in the brakes under load when driving downhill from the mountains here in Colorado around 18K miles or so.  I don't pull anything heavy, just normal expressway driving.  It got so bad when coming down from the mountains a month ago that I finally took it into my dealer here in Denver.  They have diagnosed the problem as both front rotors are warped and need to be replaced, which they say is not covered under my 36K mile bumper to bumper warranty.  Any recommendations before I go off on them?

reeseb Enthusiast

reeseb

Posted
Posted

Check your warranty. Either the rotors are covered or not. If covered, they will fix them. If not covered, no need to go off on anyone except maybe yourself for agreeing to a warranty that does not cover rotors. 

eppieguy Senior Enthusiast

eppieguy

Posted
Posted

At 28K rotors are not covered, you can say all day long that you didn't heat up the brakes and they did it on their own, or they shouldn't have this early but they have no way of telling that you didn't ride the brakes down a hill and heat them up real bad, or towed a heavy load and heated them up, it's basically a wear item. You can go off on them and they could possibly give you courtesy warranty repair but I highly doubt it. I'd just replaces them and put on new pads and move on if it were me.

  • Like 1
AirForceAngler Enthusiast

AirForceAngler

Posted
Posted

You need to change your driving style.  I've lived all over, including Colorado.  Pulled trailers big and small, up and down mountains.  In all of the trucks I've ever owned (over a dozen) I've never warped a rotor.  I put over 130K on one Silverado and it had the original pads on it when I sold it.  

2016 Sierra Owner Senior Enthusiast

2016 Sierra Owner

Posted
Posted

Rotors and pads are considered a normal wear item. They are not covered under warranty unfortunately. Going off on the dealer for that is just going to get you mad when they say no and piss them off possibly not doing a good job to fix it.

  • Like 1
rbdjr Enthusiast

rbdjr

Posted
Posted

Some times not your driving habits or trailer pulling could be something as simple as miss-Torqued wheel lugs, Make sure wheel lugs are hand torqued or at least use a torque stick. Just another possiblity thats out there. Under and Over torqued wheels can warp rotors too.

  • Like 1
BIGDOGx Senior Enthusiast

BIGDOGx

Posted
Posted

Whatever you do  "DO NOT BUY AFTERMARKET ROTORS" as 99.9% of them suck and will warp far easier then OEM ones in my opinion. One of the few OEM parts that you are better off sticking with imo.

 

 

  • Like 1
Kilgore Trout Enthusiast

Kilgore Trout

Posted
Posted

If the dealer says your rotors are warped, then maybe they are warped, but...

 

On my 2007 Yukon I have always had what felt like warped rotors when coming down a steep grade and on the brakes heavy.  No teeth rattling vibration, but very distinct pulsating, stronger the harder I stand on the brake.  The reason for my mild skepticism on the dealers findings is I have replaced my rotors once (normal service life on the truck) and the pulsating still is there on steep downgrades.

 

I haven't noticed it on my new Sierra AT4, but can't remember really standing on the brakes on a steep grade yet.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.4k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,837
    Total Members
    8,960
    Most Online
    bellssn690
    Newest Member
    bellssn690
    Joined

  • Who's Online   1 Member, 0 Anonymous, 1,009 Guests (See full list)

  • Latest Articles

  • Posts

    • cautious optimist
      GM Hard Folding Tonneau by REV review

      By cautious optimist · Posted

      This is a really late reply but I just found this thread. They won't sell the hinges. I've gone 7 rounds with them. Their solution is to buy a new cover. I'm about to buy a new cover and it won't be a Bakflip. It also won't be from realtruck.com. 
    • Chuck FB
      2 speed transfer case optional now?

      By Chuck FB · Posted

      Yes, and also pulling heavy trailers or a large camper up steep grades as well as descending grades such as the more rustic off road camping locations and using engine braking with that low gearing as well as soft ground can just suck the power . I realize pickups these days tend to have an over all lower first gear ratio compared to automatic transmission pickups from years back so that has helped a lot in its ability in high range but there comes a point if in four wheel drive the torque runs out at the wheels, certainly with a gas engine. They don't put two speed transfer cases on pickups for a cool factor, they have a function if one needs that massive torque to the wheels that high range can't deliver. 
    • Grumpy Bear
      Grumpy Bears 2015 Silverado 2WD

      By Grumpy Bear · Posted

      Notes 7/18/2026   3,400 miles on this batch of Mobil 1 Euro 5W40 since the GDI pump replacement. Alcohol runs very clean when ring seal is tight and the sump isn't getting hosed with fuel. Checked oil level at fill up today as is my practice and grabbed a white Kleenex to look at the color. What color?  I was going to change it but.....  
    • Another JR
      2 speed transfer case optional now?

      By Another JR · Posted

      4 low is really nice on steep boat ramps. 
    • Chuck FB
      Gas Prices

      By Chuck FB · Posted

      Interesting, I suspect I would have fueled up in Lee Vining as the day prior I would have filled up either in Laughlin or near there and maybe again before I entered Death Valley and once out the other side late that evening as I kept on driving into the night up near Lee Vining. Next morning I most likely fueled up in LV before heading over Tioga Pass into ( as I refer to it as "Yose .... Mite" 😁 ). And again that was 19 years ago but the price then must not have jumped out at me like the 5 bill a gallon theme of nutty cult hippy country Big Sir or head so far up their rear Aspen. I'd be curious to know where the highest prices are in the lower 48, I probably would not be far off to guess somewhere in Cali forn ie. Coldfoot and Prudhoe bay may have those prices beat but that is a whole other world up there and when prices are more normal elsewhere that is about what they can be up there I believe in no mans land. Anyway interesting that the 395 corridor is hosing people and the thing is, its tourist season and its not like there are a lot of competition options when driving up that highway from what I could see. Yup, big ole Boaterhomes and various other RV's ahead and behind me at the Yosemite entrance gate and they have to get their fuel somewhere.  

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...