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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 08-12-2005, 06:36 AM
love2drive330CI's Avatar
love2drive330CI love2drive330CI is offline
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Location: Fort Myers, FL
 
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Mein Auto: 2001 330ci
Rotor measurements???

For the 2001 330ci auto/step:

What is the size of the front and rear rotors new(in mm thickness)?
I know it shows on the rotor the minimums for the rotors, but I am trying to figure out how much was used at the current mileage I have.

I just measured my right rear rotor and I did it 5x and the smallest measurement came out to .8365 inches. If converted it properly to mm that came out to 21.24 mm. (I used the smallest measurement)

The rear rotor reads minimum is 20.4 mm
This means I have .84 mm to go before, how many miles left? I need new brake pads. Just want to know how this works out on the rotors as I am pricing them also.

I found in a old thread that the 330ci rotors measure:
front - 12.8"
rear - 12.6"

28 mm thick, is this correct???
thanks.
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  #2  
Old 08-12-2005, 07:25 AM
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Fast Bob Fast Bob is offline
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Mein Auto: 2004 330Ci ZHP 3 pedals
It it not recommended to cut BMW rotors, they`re pretty thin (compared to other high-performance rotors) as they come from the factory....they`re not very expensive (around $50 each), so you`re better off just replacing `em.

Regards,
Bob
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  #3  
Old 08-12-2005, 11:41 AM
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love2drive330CI love2drive330CI is offline
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Mein Auto: 2001 330ci
Thanks Bob. I am replacing them. Just wanted to know the thickness of the rotors new. I could always measure the new ones with the micrometer when they arrive, but thought someone might know the thickness of the new rotors.
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Old 08-12-2005, 11:54 AM
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Fast Bob Fast Bob is offline
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Mein Auto: 2004 330Ci ZHP 3 pedals
There are several mfrs. of OEM-type rotors....nominal thickness may vary from mfr. to mfr., but I think the average is around 25mm. By comparison, the front rotors from my old Audi Turbo were 32-point-something thick....quite a difference.

Regards,
Bob
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  #5  
Old 08-12-2005, 12:45 PM
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love2drive330CI love2drive330CI is offline
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Location: Fort Myers, FL
 
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Mein Auto: 2001 330ci
Yes that is a big difference in usage availability on the rotors. I bought my vehicle CPO with 17k miles on it. This is my first pad/rotor job on this vehicle. I don't know if they were replaced during the CPO but I put 43K on the vehicle and now its time.

I have some ro#'s and defect codes from the vehicle history report. I haven't figured those out yet. Doing searches now on the numbers to see what was replaced etc...
thanks.
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  #6  
Old 08-12-2005, 01:48 PM
AG AG is offline
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Location: NOVA
 
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Mein Auto: 330i
BMW rotor thickness (at least for the 330) when new is 1.6mm more than the min thickness stamped into the hub.
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