Vibration during highway speeds…

[siul2306]

I have a 2020 Kia Stinger GT1, so a couple of months ago I replaced my rotors with some new R1 eLine drilled and slotted rotors and new R1 pads. Right after it my car vibrated like crazy when braking. Had my tires balanced and wheels aligned as I was told this was the cause. The braking vibration stopped but the car still vibrated at highway speeds (80-85 mph). Was told the tires were too worn out and that they too needed replacement and that the recent balance and alignment showed this. Put new tires on the car and still the same vibration issue. Was told that the new rotors were warped and this was causing the vibration even if no more braking vibration was present. Reinstalled the OEM rotors and nothing fixed. Had KIA replaced my OEM rotors for some new ones and nothing. Finally was told by Kia that the car needed Road Force balancing and this should fix the vibration on highways. Did it and nothing. The tire shop replaced the recent new tires for a whole new set, did the Road Force again and an alignment and still the freaking vibration does not go away. I am desperate, any ideas what this might be. Kia say it is nothing on the car, but dang. New tires, new rotors, Road force balance, alignment and still after I pass the 80mph’s it vibrates like crazy. Will appreciate any suggestions.

 

[MerlintheMad]

Welcome to the forum, the font of answers.

Your description is two different things: vibration when braking and vibration at higher speeds. The two do not equate: you do not get rid of higher speed vibration by changing out brakes: you do not get rid of shuddering brakes by alignments and tire changes. "Your people" are shooting in the dark, sorry to say.

Did you bed the pads?

Was told that the new rotors were warped and this was causing the vibration even if no more braking vibration was present.

This is total BS on a couple of levels: warped rotors are not "warped" they have pad deposits on them, or cementite areas (harder iron which wears down slower than the soft iron, thus standing "proud" and being contacted first by the pads): neither cause of vibration is going to be present on virtually new rotors. And if there is no brake shuddering/vibrating issue going on, this is not a time to point to rotors as some cause of high speed shudder.

Kia say it is nothing on the car

What is that supposed to mean? If the issue or issues are not something ON the car, then you are dealing with curses and metaphysical causes: which are not under warranty. Hah!?

I don't know what else to say. But we are here to talk this out.

(re)Bed the brakes. Check the wheels for trueness. Make sure nothing, during all of this on and off replacing of stuff, on the suspension has been busted or knocked loose.

 

[siul2306]

Welcome to the forum, the font of answers.

Your description is two different things: vibration when braking and vibration at higher speeds. The two do not equate: you do not get rid of higher speed vibration by changing out brakes: you do not get rid of shuddering brakes by alignments and tire changes. "Your people" are shooting in the dark, sorry to say.

Did you bed the pads?

This is total BS on a couple of levels: warped rotors are not "warped" they have pad deposits on them, or cementite areas (harder iron which wears down slower than the soft iron, thus standing "proud" and being contacted first by the pads): neither cause of vibration is going to be present on virtually new rotors. And if there is no brake shuddering/vibrating issue going on, this is not a time to point to rotors as some cause of high speed shudder.

What is that supposed to mean? If the issue or issues are not something ON the car, then you are dealing with curses and metaphysical causes: which are not under warranty. Hah!?

I don't know what else to say. But we are here to talk this out.

(re)Bed the brakes. Check the wheels for trueness. Make sure nothing, during all of this on and off replacing of stuff, on the suspension has been busted or knocked loose.

Sorry for the confusion, maybe I did not explain correctly. Ok, the car was Ok except for the normal Stinger vibrating when braking due to deposit on rotors. I decided to replace rotors and pads to avoid this. After it, car vibrated like crazy when braking, front and back vibration, and shimmering when driving in highway, this is when I was told the 1st time to balance and aling the car. This was done and braking vibration gone, but highway speed vibration stayed. Tech told me tires needed replacement and this was causing the vibration at high speeds. Replaced tires but still same high speed vibration. Mechanic told me that it was probably the new rotors since all started when I replaced them. Removed the drilled and slotted rotors and placed the OEM’s back, but the same crazy vibration when 1st replacement came back. Kia replaced the OEM rotors with new OEM rotors, and braking vibration gone, but the high speed vibration still there. Went back to Kia and they stated there was nothing wrong with car and that the issue was that this car needed a Road Force balance instead of a regular tire balance. Did this but still vibration at high speeds. Took the car to the tire shop and they replaced the set of tires, thinking maybe it was defective new tires. Road force again and new alignment and still high speed vibration. No more braking vibration issue but the high speed issue does not go away. This my dilemma, braking is good now. I just wanted to paint the picture of how everything started.

 

[MerlintheMad]

You have been back on your OEM rotors and pads since taking the aftermarket sets off? But you went aftermarket pads and rotors to get rid of "the normal Stinger vibrating when braking due to deposit on rotors": and replacement OEM brake pads and rotors are working fine so far? So, your original issue of vibrating/shuddering brakes is solved (for the time being), but you have this high speed vibration issue that new tires, replaced by yet another set of new tires, and Road Force Balancing has not resolved.

There is no way that rotors and pads are going to cause high speed vibration: the brakes only shudder under braking. It is just possible that new tires that are defective are replaced with new tires that are defective: worse luck has happened, after all. But I would look for something more likely: such as the mechanics at some point damaged something during the install. Another possibility in the "if I didn't have bad luck I'd have no luck at all" meme is that the Road Force Balancing has so far not been done correctly.

Also, what brand of tires are you going with? Who is doing this work?

 

[siul2306]

You have been back on your OEM rotors and pads since taking the aftermarket sets off? But you went aftermarket pads and rotors to get rid of "the normal Stinger vibrating when braking due to deposit on rotors": and replacement OEM brake pads and rotors are working fine so far? So, your original issue of vibrating/shuddering brakes is solved (for the time being), but you have this high speed vibration issue that new tires, replaced by yet another set of new tires, and Road Force Balancing has not resolved.

There is no way that rotors and pads are going to cause high speed vibration: the brakes only shudder under braking. It is just possible that new tires that are defective are replaced with new tires that are defective: worse luck has happened, after all. But I would look for something more likely: such as the mechanics at some point damaged something during the install. Another possibility in the "if I didn't have bad luck I'd have no luck at all" meme is that the Road Force Balancing has so far not been done correctly.

Also, what brand of tires are you going with? Who is doing this work?

I kept the R1 pads so braking is OK.

All this tire replacements and balancing has been done in a Tires Plus store. I am thinking about taking the car to a different shop. Kia does not have the equipment to do the Road Force balance so this is why I Keep using the tire shop.

I installed the Firestone Firehawk Indy 500.

 

[MerlintheMad]

Ah, "you get what you pay for", is how "my tire guys" put it when I asked why pay that much more for Michelins. And I haven't heard anybody on here complaining about Firehawk Indy 500 vis-à-vis not running smoothly.

A long time ago, I put new tires on my Voyager; and it behaved exactly as you describe: it was fine up to c. 70 MPH, and anything over that it vibrated increasingly badly the faster I pushed it. At the time, I didn't even think, "defective tire": I just went with them until they wore enough to get new tires: a whole set of four again. Voila! no vibration, at all. So, it was the tires all the time: I had just guessed that my old van needed some (future) suspension work, shocks, etc.

Now, you've put FOUR tires on, and then replaced them entirely a second time. That increases the chances of getting a single bad/defective tire by X 4 each time. It only takes one. I'm not saying that Firestone is a bad tire; it just isn't a Michelin higher end UHP tire: I do think that the chances of getting a bad Firestone are greater than a defective Michelin (I have no idea how much the chance is). How are you going to find the one (it's probably only one) defective tire? You could have them replaced one at a time; that sounds like a hassle, but by this point you are pulling out your hair: I would be. I don't know if a tire place has a way of closely testing a tire on the vehicle for possible defects (out of true); I've never enquired about that, but in your situation I sure would be. Whatever it takes to answer the question: "Do I have a bad tire or tires?"

Until the tire question is eliminated 100%, it makes no sense to pursue other possible causes.

 

[Snowwhite]

I have the OE pilot sports and I get a minimal shake at 82-86mph or so. I have tried rebalancing with no luck. it's minimal, and the weird part is it comes and goes if I hold that speed for a while, so it's going to be difficult to diagnose. I have no issues with my brakes so far and I'm at 8k miles.

 

[siul2306]

I have the OE pilot sports and I get a minimal shake at 82-86mph or so. I have tried rebalancing with no luck. it's minimal, and the weird part is it comes and goes if I hold that speed for a while, so it's going to be difficult to diagnose. I have no issues with my brakes so far and I'm at 8k miles.

Sometime that happens, if I place the CC on 85 the vibration might come and go, not all the times but it happens sometimes. I though I was getting good tires, as I did my research and all were great. Honestly, I would have the worst of luck if indeed are the tires.

Even though of putting some $80 Delinte tires just to test them.

 

[siul2306]

Ah, "you get what you pay for", is how "my tire guys" put it when I asked why pay that much more for Michelins. And I haven't heard anybody on here complaining about Firehawk Indy 500 vis-à-vis not running smoothly.

A long time ago, I put new tires on my Voyager; and it behaved exactly as you describe: it was fine up to c. 70 MPH, and anything over that it vibrated increasingly badly the faster I pushed it. At the time, I didn't even think, "defective tire": I just went with them until they wore enough to get new tires: a whole set of four again. Voila! no vibration, at all. So, it was the tires all the time: I had just guessed that my old van needed some (future) suspension work, shocks, etc.

Now, you've put FOUR tires on, and then replaced them entirely a second time. That increases the chances of getting a single bad/defective tire by X 4 each time. It only takes one. I'm not saying that Firestone is a bad tire; it just isn't a Michelin higher end UHP tire: I do think that the chances of getting a bad Firestone are greater than a defective Michelin (I have no idea how much the chance is). How are you going to find the one (it's probably only one) defective tire? You could have them replaced one at a time; that sounds like a hassle, but by this point you are pulling out your hair: I would be. I don't know if a tire place has a way of closely testing a tire on the vehicle for possible defects (out of true); I've never enquired about that, but in your situation I sure would be. Whatever it takes to answer the question: "Do I have a bad tire or tires?"

Until the tire question is eliminated 100%, it makes no sense to pursue other possible causes.

it would be so shi...y if indeed it were the tires, I honestly have though of just getting the OEM Mich PS4's.

Will definitely try the check each individual tire at a time to eliminate the tire denominator.

 

[7Andrei7]

Maybe also check the rims. I've once had a damaged rim that was causing vibration in the steering wheel starting at about 130km/h. It was not oval but deformed slightly sideways or something like that.
And I know of a guy here in Bucharest that had the exact same problem with his Stinger when brand new. The dealer replaced 2 of his rims.

 

[rpoffen]

I have a 2020 Kia Stinger GT1, so a couple of months ago I replaced my rotors with some new R1 eLine drilled and slotted rotors and new R1 pads. Right after it my car vibrated like crazy when braking. Had my tires balanced and wheels aligned as I was told this was the cause. The braking vibration stopped but the car still vibrated at highway speeds (80-85 mph). Was told the tires were too worn out and that they too needed replacement and that the recent balance and alignment showed this. Put new tires on the car and still the same vibration issue. Was told that the new rotors were warped and this was causing the vibration even if no more braking vibration was present. Reinstalled the OEM rotors and nothing fixed. Had KIA replaced my OEM rotors for some new ones and nothing. Finally was told by Kia that the car needed Road Force balancing and this should fix the vibration on highways. Did it and nothing. The tire shop replaced the recent new tires for a whole new set, did the Road Force again and an alignment and still the freaking vibration does not go away. I am desperate, any ideas what this might be. Kia say it is nothing on the car, but dang. New tires, new rotors, Road force balance, alignment and still after I pass the 80mph’s it vibrates like crazy. Will appreciate any suggestions.

At least they didn't tell you that the solution is to not drive that fast.

 

[RogueIV]

On the high speed vibration

Factory wheels or aftermarket? If aftermarket are you using proper hubcentric rings?

Wheels mounted and torqued down with a torque wrench to proper specs, and not 3 ugga duggas of an impact gun?

None of the studs are bent?

is the mating surfaces on the hub to the rotor and rotor to wheel clean and flat? Nothing that would cause the wheel to sit wrong?

Wheels aren't bent?

Wheels properly balanced? might want a 2nd opinion here at this point as your current shops seem to be mucking about doing unneeded things.

Has anyone tried putting the car in the air and spinning the wheels to see if any of the wheels wobble?

Most of all, Does this issue happen on multiple different roads or just one? some road just aren't very flat and can exhibit vibration at certain speeds.