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Unread 01-06-2010, 07:03 PM   #1
CJman77
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Brand New Rotors not true?

Okay so got some brand new rotors from discount. And I have measured all over and have found it varies about .01 to .03 in diameter in different areas. I had a rub spot on the top edge of the rotor on my amc 20 disk conversion that was .03 "high". I filed the caliper bracket and its fine now.

My question is:


Is this normal?

I always thought brake rotors were made to exact tolerences? Am I wrong?


Thanks

Brian

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Unread 01-06-2010, 08:22 PM   #2
scooter
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Im my experiance in say the last 10 years or so if you buy new rotors or drums and do not have them checked ad most likely turned you will not be happy. The exception is high dollar stuff,otherwise its all substandard import trash. This goes for new vehicles of all makes particulary Jeep and Ford who instally factory lacking parts that warp at the hint of heat or stress.
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Unread 01-06-2010, 09:37 PM   #3
JeepHammer
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I have to agree.
I've often turned brand new rotors because they were turned incorrectly at the factory.

Import crap is just that, crap...
If you buy a $15 rotor, expect it to be poorly made and to warp at the first hard brakeing you do.

The rotors I use are about $40 each, but they usually don't have to be turned BEFORE you install them!
And they run true for quite a while.
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Unread 01-06-2010, 09:56 PM   #4
_Kyle_
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I got some $30 from Autozone that were pretty decent. But the lower the price, the lower quality you should expect.
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Unread 01-07-2010, 12:05 AM   #5
Cutlass327
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Sad thing is the Chrysler/Dodge/Plymouth minivans in the mid-late 90's - $120 each, and just as cheap as the ones you'd get at Carquest or Napa for less than $30 each.

Seems they are all Chinese steel - pits and rusts by the time the first set of pads are worn out.
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Unread 01-07-2010, 08:25 AM   #6
CJman77
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Jeephammer I spent 40. Bought it from advance instead of ChinaZone. Same cheap POS.

Where do you buy brake rotors?
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Unread 01-07-2010, 03:14 PM   #7
jkl
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Years ago when I worked for Firestone, I would turn all new rotors and drums before installing them. Most were not true from the factory.
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Unread 01-07-2010, 03:35 PM   #8
kmm
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Just went through this, Bought from CarQuest and had to have them trued up also.
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Unread 01-07-2010, 03:54 PM   #9
CJman77
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These are almost like warped left to right. I dont think my axles are warped.
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Unread 01-07-2010, 04:42 PM   #10
Area.3.Fiftyone
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Cheap rotors almost ALWAYS need to be turned.

I have never had a set of el cheapo's that weren't warped from day one.

.001 - .003 is acceptable runout from what I remember.
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Unread 01-07-2010, 10:37 PM   #11
CJman77
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I could get them turned I guess. But why put another 30 per rotor into these cheap things.

I could return them and buy made in the usa nice slotted (useless I know) rotors for 65 each.
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Unread 01-08-2010, 10:19 AM   #12
_Kyle_
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Quote:
Originally Posted by CJman77 View Post
I could get them turned I guess. But why put another 30 per rotor into these cheap things.

I could return them and buy made in the usa nice slotted (useless I know) rotors for 65 each.
They carry a warranty anyways so I guess if they suck, you can always get another set...
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Unread 01-08-2010, 11:19 AM   #13
Area.3.Fiftyone
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$30 to cut a rotor?

You're getting raped. It's only about $8-$10 per rotor.

Spend more money up front and you won't have to worry about warpage out of the box.
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Unread 01-09-2010, 12:15 AM   #14
JKM3134
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i recently had this same problem with my rear drums. replaced the pads and drums from autozone and i could not adjust them properly.

after a week of thought i took the drums to a shop and sure enough they weren't round out of the box. i had them turned for about 20 dollars and they work well.
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