Factory front brake rotors...defect?

Chris80s · June 28

On my wife's 2020 Blazer (~69000 miles), we started to notice the brakes pulsating at faster speeds. Typically around town you don't notice anything, but highway/interstate driving you will notice it. I decided to pull of the front tires and look at the brakes. I figured with the milage, the pads should be wearing out to their life span, but they actually looked decent. Still with "meat" on them. One pad has a ridge wearing in it, and that same rotor is showing the ridge too. That's not the concerning part...the other rotor appears to have a raised bump on it! The picture make it look like a pimple! Very odd and strange! NOTE: These are the factory brakes and rotors.

I'm attaching pictures of the front brakes and what they look like ate ~69000 miles.

Edited June 28 by Chris80s

Chris80s · July 10

So, I take it that one one has seen this before? Especially on the stock rotors?

Is this a defect I should pursue with GM?

I would love some thoughts or feedback.

Thanks,

Chris

CamGTP · July 10

Either there was a minor casting defect in the rotor from the factory and it took 60,000+ miles of wear to make it surface as the rotor got thinner. Or something got picked up and it fused to the rotor by the heat from braking. Likely the first one in my eyes.

GM will do nothing for you. It's a 6 year old vehicle and brakes are not covered on any sort of warranty at this time. I've worked in the repair industry as well as selling parts for over 15 years now. Even the highest end factory rotors or aftermarket rotors can have defects that come to light over a period of time.

Buy yourself some new rotors/pads and all will be good. If you don't go back with GM parts I suggest new Platinum Rotors and Adaptive One pads from Napa. Never had any real issues running their parts.

Edited July 10 by CamGTP

GMCustomerService · 2026-07-23T16:41:22Z

Your safety is our number one priority, @Chris80s, and we encourage you to bring your Blazer’s brake concerns to the attention of your local Chevrolet dealer. Our dealers have the tools and expertise to properly diagnose and recommend any repairs needed. We would also like the opportunity to act as an extra layer of support between you and your dealership as we pursue a resolution of your concern. To get started, please visit: https://s.chevy.com/support-request and fill out the request form with the pertinent details to ensure your request is routed correctly. We will keep our eyes peeled for your outreach.