All rotors warped

All four rotors on my SUV are warped. There are no other problems, except for that. The brake pads and the disc are in good order. I researched about warped rotors and found that bad brake pads are usually the cause. While reading in forums, I found other drivers with this same problem in this make/model. The dealership told me that ‘heat’ had caused all four rotors to warp at the same time. That not only sounds wrong, but doesn’t make sense. I live in a hot climate and if that were the cause of warped rotors, there would be thousands of drivers taking their cars in for rotor replacement
Experienced mechanics share their insights in answering this question :
The braking system must be checked over a little more closely. Warped brake rotors can also be caused by malfunctioning brake calipers that are not releasing a they should. This can be caused by the caliper itself or a blockage in the flexible hose. If the rotors were machined at the last service, consider installing new ones with new brake pads and all new hardware. If you would like a second opinion, a certified technician from YourMechanic can come to your home or office to inspect your vehicles braking system.

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One of the most common causes of warped brake rotors is excessive heat. Every time you press the brake pedal, the brake pads clamp down on the rotor to create friction. This friction generates heat, which can cause the rotor to warp if it becomes too hot. Another common cause of warped brake rotors is hard braking.
If a mechanic identifies rotors as warped or excessively worn, they`ll advise replacing them with new brake pads. Alternatively, resurfacing rotors is an option but may reduce their durability and accelerate brake pad wear.
What can you do if you have warped rotors? You have two choices: replace them, or machine them. Warped rotors, if they`re thick enough, can be turned in a machining process that uses a lathe to smooth the rotor. Unfortunately, since it`s a stressed metal, your rotor can return to its old, warped shape.
A good way to prevent brake rotors from becoming warped is by being mindful of your braking habits. When you constantly press on the brakes or hold them down for an extended period of time, you can cause the excessive heat that can warp the rotor surface.
Install a High-Quality Brake Rotor

The heavier metal rotor reduces the distortion from warping by stopping heat damage and allows the rotor to operate using cooler temperatures. This also prolongs the life of your brake rotor and reduces the wear and tear on your brake pads.

Probably the most common sign of a warped brake rotor is the vibration through the brake pedals when pressure is applied on them. Sometimes you can feel it even when there is only a light amount of pedal pressure on the brakes. Other times, it can only be felt when slowing down drastically from higher speeds.
If your rotors are faulty, they may produce a squeaking, squealing, or grinding sound when you apply the brakes. Warped rotors usually emit a high-pitched squeak, while severely worn rotors tend to make a scraping noise.
Warped rotors can cause a squeaking noise when the brakes are applied. They can also make a scraping or grinding sound when they`re warped and worn down. The squealing noise, however, can also be made by brake pads that are worn out.
TOM: As far as we know, ceramic pads do not prevent warping. If you misuse or overheat your brakes, rotors will still warp. It`s possible that the improved heat-dissipation qualities of the ceramic pads may help prevent warping to some degree, but you`re not going to be immune from warped rotors.
As brake rotors absorb heat and temperatures go beyond 900°F, cast-iron 1-piece brake rotors actually begin to try and grow up to 1mm in diameter, but they can`t.
Common Causes of Worn Rotors

Panic or emergency braking at high speeds can cause rotor wear. The friction from the brake pad grabbing the rotor can cause high enough heat to result in wear.

driving with warped rotors is not considered safe, and the brake rotors can eventually crack or break, leaving the vehicle at an extreme loss of braking power. when brake rotors become warped, the amount of force moving the steering wheel back and forth may be violent, and enough to lose control of the steering wheel.
Nothing about sitting in a parking lot (even in rain and snow) would make the rotors warp or the pads wear out. Brake rotors do get rust on them when they sit. But your dealer is correct that the rust is quickly scraped off by the pads when you drive the car.
If you have an open-spoke wheel design, you can run your finger vertically down the brake rotor friction surface. If you can feel and see noticeable grooves, then it`s time for new brake rotors. For cars with hub caps that don`t expose the rotor, you will need to remove your wheel to inspect your brake rotors.
Malfunctioning Brake Calipers

With the brake calipers squeezing the rotors together, a malfunctioning brake caliper may exert too much force, putting too much stress on a overheated brake rotor causing it to go off-balance, leading to warped brake rotors.

As brake rotors absorb heat and temperatures go beyond 900°F, cast-iron 1-piece brake rotors actually begin to try and grow up to 1mm in diameter, but they can`t.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

All rotors warped – 2009 Kia Borrego
ANSWER : The braking system must be checked over a little more closely. Warped brake rotors can also be caused by malfunctioning brake calipers that are not releasing a they should. This can be caused by the caliper itself or a blockage in the flexible hose. If the rotors were machined at the last service, consider installing new ones with new brake pads and all new hardware. If you would like a second opinion, a certified technician from YourMechanic can come to your home or office to inspect your vehicles braking system.

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Warped brake rotor–what causes that and how to repair
ANSWER : You need to change both. My advice is not to have them turned because if you have rotors made out of steel and they warp, and you turn them the other way to make them flat then they are thinner. They already warped once and they are going to warp again even faster.

So just replace them with new rotors and brake pads. They are not all that expensive.

The only difference between expensive and cheap pads is that cheap pads will make noise but with brand new rotors, they are not going to make any noise. So you don’t have to spend that much doing it. And the reason they warp is because heat just eventually builds up and they get so hot that they warp. So you’d want to check the things like if the master cylinder is sticking out, if the caliper is sticking out, are the brake hoses collapsing. Because if they keep warping, it means that for some reason the brakes are running sticky on and getting too hot.

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Does the Sorento alternator fit the 2009 Kia Borrego? I know that there was another part that was replaced and it was a Sorento
ANSWER : Hi there, thanks for writing in. My resource states that 2007-2009 V6 Sorento will work. It has a 2 pin connector. If your Borrego that has the upgraded entertainment system, it will have a 4 pin connector and the Sorento alternator will not work. If you need help with an alternator replacement or installation, an expert from YourMechanic can source the correct alternator for your car or install an alternator that you already have obtained.

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I have a 2016 kia forte. A rodent ruined my wiring harnesses causing safety and operational issues. Kia says the harnesses have to
ANSWER : Hi there. The automotive manufacturer is 100% correct in their estimation about splicing a wiring harness. Today’s vehicles are 100% controlled and monitored by electrical and computer operated systems. These systems require a clear and unaltered wiring system that sends electrical signals from sensors and components to the ECU and back. Splicing or altering the wiring in any way is very unsafe and can disable several safety systems including air bags, anti-lock brakes and other systems.

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Rotors replaced several times as they get warped quite quickly
ANSWER : Rotor warpage generally occurs when too much heat builds up and cannot be transferred away from the rotor. Heavy braking, a lot of stop and go traffic, heavier than normal vehicle loads, heavy or oversized custom wheels, sticking calipers – basically anything that puts additional stress on the braking system – can cause heat to build up and warp rotors.

You may want to consider a slotted and/or drilled rotor as they are designed to transfer more heat away from the braking system based on their design. The only thing with these types of rotors is that they cannot be resurfaced.

You may want to enlist the help of a mechanic, such as one from YourMechanic, who can inspect the braking system to ensure no dragging braking components, and install new slotted/drilled rotors to prevent future warpage.

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Brake rotors keep getting warped – 2010 Land Rover LR4
ANSWER : Brake rotor warpage occurs when there is too much heat created during braking operations and then the heat is not dissipated quickly enough. Heat is generally removed from the brakes via ductwork directing air over the brakes, slots in the wheels, and the brake discs that are also vented. Many times, changes in wheels or driving habits will cause heat buildup in the braking system. If this is the case, you may want to consider rotors that are either drilled, slotted or both to help handle the heat demands on you braking system.

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The rotors got warped the second time
ANSWER : Rotors become warped from things such as heat. Most of the time, the warpage happens when the rotor is hot from braking, and then you hit water or spray water on them. Going from hot to cold really quick will warp the rotors in an instant.

Using aftermarket parts may save you money on the parts, but you may have the same issues with warpage if they get zapped with cold water when they are hot.

Make sure that whoever puts the new rotors on torques the wheels using a torque wrench, and not an air gun. A lot of times, the rotors get warped from not tightening the wheels with a torque wrench or torque stick.

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I have a 535i with a pseudo M package, regardless how do I know what the Rear Rotor size is (330mm or 345mm).
ANSWER : Hi Jim,
Unfortunately, if the car was not a factory "M" package car (or a pseudo M car as you mention), there is not really a way to tell what size the rotors are without taking them off and measuring them, unless you know for sure that the "M" package parts were installed, including the rotors.

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