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#3444479 - 08/03/14 07:55 AM What is this?
Char Baby Offline


Registered: 05/25/05
Posts: 8314
Loc: Rochester NY
When comparing new brake rotors for my vehicles, I notice that some rotors mention in their description/spec that:

They have a rust preventative coating!

I see this on many auto parts sites. For example, the AAP WearEver Rotors mention a rust preventative coating but, the WAGNER DO NOT mention this.

I have used both rotor brands and notice no extra rust prevention while on the car...thay all rust the same! smile

Is this just a light maching oil applied to the rotors after mfg'ing for storage while in the BOX???
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#3444482 - 08/03/14 07:58 AM Re: What is this? [Re: Char Baby]
LotI Offline


Registered: 01/01/13
Posts: 514
Loc: America's Dairyland
My guess is the hat of the rotor is painted/powder coated. Have you seen pictures or seen them in person?
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#3444483 - 08/03/14 07:59 AM Re: What is this? [Re: Char Baby]
3800Series Offline


Registered: 08/02/14
Posts: 778
Loc: Gulf Coast, MS
I wouldn't put to much thought in it. No matter what it is the first time you brake hard odds are it will be shaven off.
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#3444486 - 08/03/14 08:00 AM Re: What is this? [Re: LotI]
Char Baby Offline


Registered: 05/25/05
Posts: 8314
Loc: Rochester NY
Originally Posted By: LotI
My guess is the hat of the rotor is painted/powder coated. Have you seen pictures or seen them in person?


Not really! I have purchaced non painted hats/vents that mentioned this. The painted hats such as Raybestos Adv Tech or Centric Premium mention the paint. Here is an example:

http://www.rockauto.com/catalog/moreinfo.php?pk=300931&cc=1373879

http://shop.advanceautoparts.com/p/wearever-brake-rotor-front-yh145308/5670068-P?navigationPath=L1*14921%7CL2*16462%7CL3*15696#fragment-2


Edited by Char Baby (08/03/14 08:05 AM)
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#3444492 - 08/03/14 08:06 AM Re: What is this? [Re: Char Baby]
Char Baby Offline


Registered: 05/25/05
Posts: 8314
Loc: Rochester NY
Thanks, I won't put too much faith in this term/statement of "rust prev coat"!
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#3444514 - 08/03/14 08:38 AM Re: What is this? [Re: Char Baby]
Roadkingnc Offline


Registered: 07/16/11
Posts: 657
Loc: NC USA
Its not the friction surface, its the hat part that meets the wheel that is treated. If you have alloy wheels and the rotor is visible the treated ones would be the ones to get.
If appearance isn't important to you go with the untreated ones.

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#3444521 - 08/03/14 08:44 AM Re: What is this? [Re: Char Baby]
Corvette Owner Offline


Registered: 01/22/03
Posts: 1673
Loc: Waldorf, Maryland
Usually zinc plating, and it works fine, just not on the friction surface. This surface is cleaned after a few stops.
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#3445584 - 08/04/14 11:33 AM Re: What is this? [Re: Char Baby]
Jiblet Offline


Registered: 09/24/09
Posts: 105
Loc: Massachusetts
Maybe they mean the cosmoline coating or whatever they use these days.

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#3445594 - 08/04/14 11:49 AM Re: What is this? [Re: Char Baby]
MolaKule Offline


Registered: 06/05/02
Posts: 15222
Loc: Iowegia - USA
Originally Posted By: Char Baby
When comparing new brake rotors for my vehicles, I notice that some rotors mention in their description/spec that:

They have a rust preventative coating!

I see this on many auto parts sites. For example, the AAP WearEver Rotors mention a rust preventative coating but, the WAGNER DO NOT mention this.

I have used both rotor brands and notice no extra rust prevention while on the car...thay all rust the same! smile

Is this just a light maching oil applied to the rotors after mfg'ing for storage while in the BOX???


Most packaged auto parts contain a film of rust prevention oil to retard or prevent rust accumulation of parts while in storage.

In the case of rotors, this film should be thoroughly removed by brake cleaner before installation.

One thing you do not want is an oil film or any lubricant getting into the pad material to promote glazing.


Edited by MolaKule (08/04/14 11:50 AM)
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#3446357 - 08/05/14 07:04 AM Re: What is this? [Re: MolaKule]
Char Baby Offline


Registered: 05/25/05
Posts: 8314
Loc: Rochester NY
Originally Posted By: MolaKule
Originally Posted By: Char Baby
When comparing new brake rotors for my vehicles, I notice that some rotors mention in their description/spec that:

They have a rust preventative coating!

I see this on many auto parts sites. For example, the AAP WearEver Rotors mention a rust preventative coating but, the WAGNER DO NOT mention this.

I have used both rotor brands and notice no extra rust prevention while on the car...thay all rust the same! smile

Is this just a light maching oil applied to the rotors after mfg'ing for storage while in the BOX???


Most packaged auto parts contain a film of rust prevention oil to retard or prevent rust accumulation of parts while in storage.

In the case of rotors, this film should be thoroughly removed by brake cleaner before installation.

One thing you do not want is an oil film or any lubricant getting into the pad material to promote glazing.


Oh absolutly! I have seen this machine oil on most new rotors in the box(inside the plastic bag). I always spray brake cleaner on the new rotors to remove the oil. Though, I have purchaced new rotors that were just inside the box(no bag) and were dry. I spray'em clean anyway!

Thanks,

CB smile


Edited by Char Baby (08/05/14 07:05 AM)
Edit Reason: smile
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