Warped rotor? and weird rust spot - Hyundai Genesis Forum
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Warped rotor? and weird rust spot

The past few weeks i’ve been hearing a slight scratchy noise coming from the front. I’m assuming it can be a warped rotor. recently it has started to sound very scratchy when braking and sounds very grindy. The type of sound that will make you not want to brake lol. checked out my rotors and this is what i found on the front right. the front left leaves a lot of break dust as i have noticed that rim always gets way dirtier. Any thoughts? i plan on replacing the rotors and the pads very soon.
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What pads and how many miles and what brakes? I would not worry about that rust spot. And as long as the pads are not gone and you are pressing the metal backing plate against the rotor then no problem there. The rotor looks like it has a bad spot in it but I would say it is only cosmetic.

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What pads and how many miles and what brakes? I would not worry about that rust spot. And as long as the pads are not gone and you are pressing the metal backing plate against the rotor then no problem there. The rotor looks like it has a bad spot in it but I would say it is only cosmetic.
i purchased the car at around 74,000 miles. it has brembo brakes but idk if it’s the stock rotor and idk what pads they are. on car fax it says the last time the brakes were changed was at 51,000 miles. The brakes grind the most when the car is about to come to a complete stop and i can feel it on the brake pedal. It’s really an ear sore
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Your rotor looks like a Brembo rotor. It's a vented disc having an open slot between the inner and outer disc. I have 101,500 miles on mine and am on my 3rd set of front pads. I get the ceramic pads from Autozone and my rotors have held up pretty well. The next pad change I will remove the rotors and have them turned. Not sure it's needed though since they are not grooved or warped. The ceramics leave very little dust and stop the car much better than stock pads.
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those spots can form if the car has been sitting a long time exposed to rain and there was some contamination on the pads like a small rock or peice of metal. the rotor will get a deep oxidization spot and then subsequent use will sweep away the rust but leave a small crevice.

A warped rotor doesn't make noise, it just wobbles and induces vibration into the steering column and/or the entire car when you hit the brakes.

I think you just have an inclusion on that one pad that's making the noise. No harm in replacing the front pads first, you can try them out and if the noise hasn't gone away, get some new rotors and then bed them in while your pads are still relatively new (don't wait too long if it's still a problem, the best bedding in time for pads/rotors are when they're both new and clean).

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It just looks like someone didn't use brake clean when changing out rotors or pads.

Basically it looks like a thumb print.
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The OE Brembos are great rotors. So many dump them for bling. Maybe not the best for all out track driving though. I've got +95k miles on mine and only half worn. Smooth as can be.
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The OE Brembos are great rotors. So many dump them for bling. Maybe not the best for all out track driving though. I've got +95k miles on mine and only half worn. Smooth as can be.
They probably resurfaced them. Thats what I mean by change out.


Anyways, If it's the fronts, then I highly doubt that, because the rotors are what, 2" thick.

The rears are more likely to warp because of it not being vented (assumption, because I'm still running base model brakes)
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All 4 corners are vented OEM. The rears are a little thinner and have a bigger hat, so less contact surface. They never get hot enough to warp unless you've got some serious pad dragging happening, I've never been able to get them to smoke at the track and they're super annoying to get properly bedded in.

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sometimes when i brake the steering wheel shakes slightly. Additionally, I have had some instances where it pulls to one side when i’m braking. I have been considering getting new pads and new slotted and drilled rotors. I would probably get the pads first though and see if the noise and grinding goes away.
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sometimes when i brake the steering wheel shakes slightly. Additionally, I have had some instances where it pulls to one side when iím braking. I have been considering getting new pads and new slotted and drilled rotors. I would probably get the pads first though and see if the noise and grinding goes away.
Wiggle means new rotors for me. Chuck 'em. You're probably getting the pull because the brake balance is off due to the warping - pads won't fix that. Get some Stoptech (Centric) OE blank brembo rotors, they hold up nice. Or go slotted for some bling factor

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wiggle could be a number of factors.

tire balance
tire out of round
wheel bearings
bad ball joints
etc...

but if it's causing steering wiggle, then it does have to do with something in the front.
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New aggressive pads and some hard braking will probably clean off the rotors. Don't have them turned down unless that does not fix them.

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It looks like that little finished part of the rotor flaked off. Run you finger nail over it, if it feels like a dimple (the rusty part is below the finished part of the rotor), then it flaked off. It's happened before and probably will happen again, rotors are made from iron and when the finished part flakes off, you have the old rusty iron part underneath. The grinding you hear is probably the flaked off part embedded itself into your pad. Also, if you're having a shimmy and pull when braking, it's the rotors. They do look like they have some grooves in them, run your finger nail up and down over the finished part of the rotor, if it's got grooves, it will shimmy and pull. Also, ceramic pads are not the best for performance, they make little to no dust but cook the rotors, because they transfer heat to the rotors instead of absorbing the heat, they do not have as good of a bite and they fade more. Semi-metallic are better performers or better yet get composite pads which are semi-metallic and carbon, but you will be cleaning your rims more. Then again those rims look like they are easy to clean.

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I have determined that the noise and grinding is coming from my front left wheel. it is honestly sounding like metal to metal at this point but the pads look fine to me, then again i haven’t taken the wheel off to get a closer look at everything. It feels almost dangerous to brake so i’m trying to drive as calmly as possible until my brake kit gets here
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here is a video of what it sounds like. It gets very loud when I am about to come to a complete stop and I feel it in the brake pedal and steering wheel.

https://youtu.be/6u-HcNGF8co
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Wheel bearing is what I'd be checking next if it ain't the brakes. Put that side up on a jack and grab the wheel by it's face and see if there is any play by pushing and pulling on the rim. I had this happen before on another car and thought it was my brakes and ended up discovering it was the wheel bearing making all the noise.
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Originally Posted by Ryno269 View Post
Wheel bearing is what I'd be checking next if it ain't the brakes. Put that side up on a jack and grab the wheel by it's face and see if there is any play by pushing and pulling on the rim. I had this happen before on another car and thought it was my brakes and ended up discovering it was the wheel bearing making all the noise.
Thank you for the advice. I’m prettu convinced it’s the brakes, the rotor looks very scratched up. I ordered this brake kit. Installing tomorrow
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I ordered this brake kit

https://m.autozone.com/brakes-and-tr..._252162_0?aqs=
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Last edited by erikv51; 3 Weeks Ago at 07:33 PM.
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