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Rotor Runout and shims/hub correction plates

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Old Jun 17, 2021 | 10:26 PM
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CoolRunninJA
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Rotor Runout and shims/hub correction plates

Hello,

I am planning to replace all 4 of my rotors and brake pads next week... During my research I came across rotor runout and cant seem to find answers I am looking for.
Does anyone know what shims/hub correction plates I would need if I have it? Are they called something else? Where to buy them locally? Im in south FL.

I found 2 sizes .006 and .003... on rockauto
I don't want to order the shims before I know I have a runout problem... or buy them and not need them or not able to return them.

Any advice or experience would greatly be appreciated. Thanks in advance.
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Old Jun 18, 2021 | 05:43 AM
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Rotor run out is a measurement used to determine if your rotors are warped or not.
If they are warped, replace them.
I wouldn't lathe 'em.

Do you mean endplay? And axle shims?
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Old Jun 18, 2021 | 09:07 AM
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CoolRunninJA
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Originally Posted by SkysG37
Rotor run out is a measurement used to determine if your rotors are warped or not.
If they are warped, replace them.
I wouldn't lathe 'em.

Do you mean endplay? And axle shims?
In the DIY videos/guides... they check for rotor runout on the new rotors... and if there is any issue they use shims/hub correction plates.

im going to replace the rotors anyway with power stop rotors/brakes. Just want to make sure everything is lined up as best as possible.
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Old Jun 18, 2021 | 10:56 AM
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Originally Posted by CoolRunninJA
In the DIY videos/guides... they check for rotor runout on the new rotors... and if there is any issue they use shims/hub correction plates.

im going to replace the rotors anyway with power stop rotors/brakes. Just want to make sure everything is lined up as best as possible.
What you're referring to is shims to align the rotor properly depending on how close it is to one of the sides on the caliper. Like previously stated the run out is for if the rotor is warped.
Some brand new rotors can be warped however there is nothing you can do other than cutting the rotor straight but a that point it would be best to return them.

One way you can determine if the rotors are good is to bring them to a brake shop and have them put them in the lathe and spin them prior to mounting them, you'll see then if they are straight.
You might or might not need the shims to distance them evenly from from the rotor but in all honesty almost no one suffers from this.

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Old Jun 18, 2021 | 11:23 AM
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CoolRunninJA
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Originally Posted by BULL
What you're referring to is shims to align the rotor properly depending on how close it is to one of the sides on the caliper. Like previously stated the run out is for if the rotor is warped.
Some brand new rotors can be warped however there is nothing you can do other than cutting the rotor straight but a that point it would be best to return them.

One way you can determine if the rotors are good is to bring them to a brake shop and have them put them in the lathe and spin them prior to mounting them, you'll see then if they are straight.
You might or might not need the shims to distance them evenly from from the rotor but in all honesty almost no one suffers from this.
thank you for the clarification. Thanks again guys!
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