Are all four rotors the same?

my garage told me i need all four rotors and brakes….. $800……..
if i buy them else where, are they all the same?

My car has 71000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hi there. On vehicles with four wheel disc brakes and rotors, the parts are usually made for front or rear applications – usually meaning that they’re not interchangeable. If you are looking to service your brakes elsewhere, our expert mechanics can come to your home or office to replace the brake pads and rotors for you using the correct parts. You could visit our estimator page and enter your vehicle information so that you can get a quote for this repair and compare prices.

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When the time comes to replace your rotors, remember that not all rotors are made the same. In fact, there are four different types to choose from, so before replacing your vehicle`s rotors, make sure you`re selecting the right one for your needs.
Remember, not all brake rotors are created equal. Just like brake pads, rotors can be made from various metal materials, producing different results.
It`s very rare these days that the front and rear rotors are the same, it happens, but it`s the rare exception. Most modern cars, trucks and SUVs use a larger and thicker rotor diameter on the front of the vehicle to allow for quicker and safer braking and to absorb the heat from the brake pads.
If you`re replacing OE equipment with something comparable, there`s no reason you can`t switch from one brand to another. And there`s no reason you can`t buy pads from one company and rotors from another.
It is particularly important to choose high quality brake rotors when picking a slotted style. If the brake rotors are not properly machined, from the inner to the outer edges, they can crack sooner than they otherwise would or should.
They are side specific. Since the rotors are vented for cooling, it`s a function of the direction of the cooling fins built into the rotors. So the answer is no, although they will most likely fit, you shouldn`t use the same part number rotor on both sides.
Call your local OEM dealer and ask for the original rotor sizes or OEM rotor/pads part numbers based on your vehicle`s VIN number (VIN# is referenced in your ownership papers). The dealership may not tell you the rotor size, but they will give you the genuine part numbers for your vehicle.
Normally both rotors need to be replaced because they will usually have the same amount of wear. Even if one side is “good enough” it is wise to replace both brake rotors at the same time to maintain even braking as any difference in rotor thickness will cause the brakes to pull to one side.
Brake rotors and pads are not universal to all cars but can be interchangeable between certain vehicles. The sizing of the pads and rotors, hub bore/pattern, and wheel size are just a few factors that have to be checked before even attempting a swap.
You do not need to replace all 4 rotors at the same time, but it is recommended to replace the rotors and pads as a set for each axle front or back at the same time. If the front brakes need to be replaced but the rear brakes are not worn out yet, then you do not need to replace the rear brakes.
Slotted rotors

For rotors with slots machined in the same direction as the internal cooling vanes, the slots should lean toward the back of the car. For rotors with slots machined in the opposite direction as the internal cooling vanes, the slots should lean toward the front of the car.

Discs or rotors work by pads that clamp down on the rotor to create friction to slow your vehicle. The pads indeed wear out first. The rotor`s primary function is to absorb that friction. The more worn down your rotors are, the less heat they can absorb at one time, which results in longer stopping times.
Every car comes with two front brakes and two rear brakes. Older vehicles typically have drum brakes in both the front and rear. In contrast, modern cars tend to have either disc brakes on all four wheels or disc brakes in the front and drum brakes in the back.
If you install a curved vane rotor backwards, it won`t be able to pump air as effectively. That means a curved vane rotor installed backwards can`t dissipate heat as well as it should. To install a curved vane rotor correctly, make sure the vanes at the top of the rotor are tilting rearward.
There are four brake rotors installed in cars, one for each wheel. The rotors` primary purpose is to slow down the turning of the car`s wheels by utilizing friction.
Simply, no. Disc brake calipers require specific mounting points on the fork and frame, while the wheels need specific hubs onto which the rotor can be installed.
Rotors cost between $30 and $75 each. Higher-quality rotors like Duralast Gold, which feature a coated hat and edge and are designed to outperform your vehicle`s original equipment, usually cost a little more. Labor at a shop to replace rotors and pads is approximately $150 to $200 per axle.

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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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.

Read Full Q/A … : Are all four rotors the same?

Does my car need new brake pads and rotors?
ANSWER : Hi there:

In most instances, if the brake pads have not fully worn out, the rotors will not suffer scarring or pitting which typically means the rotors need to be surfaced or replaced. However, it really depends on the damage that has been done or if the rotors may have been warped due to excessive heat or braking. Before you take your vehicle to any of these shops, you might want to have professional mobile mechanics complete a brake pads and rotor inspection to give you an accurate assessment of the repairs you need to have completed on your Volvo.

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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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how thin can rotors be before replacing?
ANSWER : Nothing sounds right about that. There are references that tell mechanics how thick rotors are when new, when they’re too thin to machine, and when to discard. The rotors need measured with a micrometer to check this. Rust and some other factors can shorten the life of a rotor before it’s too thin, but you should have been informed of this. They are many reasons to replace a caliper. Brake pads being too thick are not one of them. Either the piston in the caliper is not compressing all the way, there’s a seized caliper slide, or they have the wrong pads. If the piston is stuck, this warrants replacement. I would get a second opinion from a certified mechanic, such as one from YourMechanic, who can diagnose your brake system and suggest what to do from there. Good luck.

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Rear rotors on a sienna 2013 too thin
ANSWER : Any time a brake rotor is resurfaced to get rid of surface grooves or warpage the cutting off of a layer of the metal is removed until a flat smooth surface is achieved. After the surface is resurfaced the rotor thickness will need to be checked to see if the rotor resurfacing caused the rotor thickness to go below the minimum thickness the rotor can go without causing rotor failures. If the rotor is too thin then it will need to be replaced with a new rotor. The problem is you may have to pay the labor for the resurfacing of the warped rotor even if it cannot be used. I recommend replacing the rotor if it is warped or grooved to save money. Sometimes it is cheaper to replace them than it is to try and resurface them. If the dealer says they will not charge you if they cannot be resurfaced then let them try and resurface them.

Read Full Q/A … : Are all four rotors the same?

Are all four rotors the same?
ANSWER : Hi there. On vehicles with four wheel disc brakes and rotors, the parts are usually made for front or rear applications – usually meaning that they’re not interchangeable. If you are looking to service your brakes elsewhere, our expert mechanics can come to your home or office to replace the brake pads and rotors for you using the correct parts. You could visit our estimator page and enter your vehicle information so that you can get a quote for this repair and compare prices.

Read Full Q/A … : Are all four rotors the same?

New front pads & rotors (2mths) and hear a grinding noise when coming to a slow gradual stop. What could be causing this?
ANSWER : Hello, thank you for writing in. The last technicians that worked on your vehicle are not wrong. There are certain types of brake pads that will make a squealing noise when the brakes are applied. These are typically made from a metal composite material. You can always research the brand they put on and find out more about the brake pads. This would give you a good idea of what you should reasonably expect. Are the brakes exhibiting any other types of symptoms? If there is any sponginess in the pedal, shaking or vibrating, hard stops, or other symptoms then there may be more cause for concern. In situations like these, if you are expecting to drive the vehicle a longer distance in the near future, it is recommended that you get a second opinion. Our technicians can dispatch to your home or office.

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