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#4728366 - 04/15/18 11:14 PM Brake Rotors - what causes this?
99Saturn Offline


Registered: 02/25/13
Posts: 1427
Loc: NY
Finally got around to taking off my snow tires and took a look at my rotors and saw the below.




What causes this? Rotors are about 2 years old, 6,000 miles.

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#4728367 - 04/15/18 11:16 PM Re: Brake Rotors - what causes this? [Re: 99Saturn]
oldhp Offline


Registered: 06/28/12
Posts: 1652
Loc: USA
Almost looks like the pads aren't seated in the caliper squarely.
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#4728370 - 04/15/18 11:30 PM Re: Brake Rotors - what causes this? [Re: 99Saturn]
Superflop Offline


Registered: 07/01/09
Posts: 425
Loc: Seattle
Road deicer
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#4728375 - 04/15/18 11:46 PM Re: Brake Rotors - what causes this? [Re: Superflop]
KneeGrinder Offline


Registered: 11/28/17
Posts: 222
Loc: North of you Idaho
Originally Posted By: Superflop
Road deicer


Ding Ding, we have a winner!

I'm only getting 3 or 4 years out of a set of rotors, and I remove my pads a reapply brake pad lube or my pads will seize in a couple years.
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#4728386 - 04/16/18 12:35 AM Re: Brake Rotors - what causes this? [Re: 99Saturn]
maxdustington Online   content


Registered: 01/21/17
Posts: 849
Loc: Toronna
My rears look similar but the corrosion is in the center. I had malfunctioning calipers for a while. It is deeper than it appears.

Salt + poor quality metallurgy
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#4728392 - 04/16/18 01:04 AM Re: Brake Rotors - what causes this? [Re: 99Saturn]
pdxglocker9mm Offline


Registered: 11/09/15
Posts: 75
Loc: Portland, OR
Salt/road deicer
They will not be able to be turned clean.
New rotors is what will fix it.
Try ebay
I got a few sets of pads and rotors off ebay a few years back
Callahan auto parts yup just like Tommy boy.
05 Pontiac vibe was like 60 for pads and a pair of rotors shipped.
08 gmc sierra was like 95 for pads and rotors.
They are fine only problem is the vibe is a little squeeky some times. But so were the wagner thermoquiets they replaced Looking back on it i should have just snagged the rotors for 42 and got the ac delco pads for 25
It did take 18 months and about 15000 miles for the brakes to squeek.
So if this is adventure you will be doing every 2 years or 6000 miles
The callahan rotors and pads would be a excellent choice.
Even though they are cheap they are of a decent quality.
The rotors are heavy and well constructed.
The pads were ceramic for both applications.
I have never felt that they were inferior in any way they stop very well.

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#4728404 - 04/16/18 02:02 AM Re: Brake Rotors - what causes this? [Re: 99Saturn]
Brybo86 Offline


Registered: 10/08/11
Posts: 2955
Loc: Chicago, IL
Stuck slide pin , or incorrectly installed pads.
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#4728431 - 04/16/18 04:22 AM Re: Brake Rotors - what causes this? [Re: 99Saturn]
The Critic Offline


Registered: 08/30/04
Posts: 19877
Loc: CA
Low quality rotors, metallurgy issue. But this is largely due to the road salt in your area. Try some rotors that come coated; it may delay the issue a bit.
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#4728455 - 04/16/18 05:49 AM Re: Brake Rotors - what causes this? [Re: 99Saturn]
Mainia Offline


Registered: 04/06/15
Posts: 227
Loc: Upper midwest
Originally Posted By: 99Saturn
Finally got around to taking off my snow tires and took a look at my rotors and saw the below.




What causes this? Rotors are about 2 years old, 6,000 miles.



If you think that looks bad wait till you see the inside side of that rotor.

I live in the Minneapolis area and they salt the [censored] out of our roads, I also saw a lot of this when I owned a hobby Audi repair shop. First off 6,000 miles in 2 year also explains some of it. Looks like your car does a lot of sitting, that in turn means a lot of time to start oxidation. Just saying, you have I would bet 50 to 60% less braking power because of reduced "swept area", you are a danger on the road. When it rains, I always take the car out for a 4 minute ride of heavy braking to clear the rust of from the rain if I know the car will not be use within 1 1/2 days. IE weekends since my car is use as a work car and we use my wife's car more on weekend.

When My Honda was recalled with the airbag recall I was given a loaner car from Honda and was able to park my carin my garage for 3 months will waiting for new airbags. I signed a paper that I was not going to drive it and if I did they were not liable. I did drive my car around the block every 2 weeks to clear the fine rust that was starting.

Ways to reduce this when you get your new brakes:

1) Don't let rust even start after a rain, drive the car with some heavy braking.

2) Become a heavy braker, use them or lose them.

3) Buy coated brake rotors so rust that can start on the outer edge has a harder time migrating inward.

IE EBC brakes or others of the same.(can be electro plated too) http://www.autoanything.com/brakes/ebc-brake-kits

4) Don't let rust even start after a rain, drive the car with some heavy braking.

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#4728463 - 04/16/18 06:16 AM Re: Brake Rotors - what causes this? [Re: 99Saturn]
Tman220 Online   content


Registered: 09/20/16
Posts: 153
Loc: MN
lack of driving in the rust belt is what causes that. The only real way to prevent this is to drive the car more to keep the rust from getting too deep and abrasive.

once it starts, it cant be reversed without machining the rotors or replacing
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#4728531 - 04/16/18 08:20 AM Re: Brake Rotors - what causes this? [Re: 99Saturn]
Alex_V Offline


Registered: 04/10/16
Posts: 1174
Loc: Campbellsville, KY
Rust, plain and simple. I see this a lot in central KY from vehicles that appear to have come from further North.
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#4728548 - 04/16/18 08:34 AM Re: Brake Rotors - what causes this? [Re: 99Saturn]
NormanBuntz Offline


Registered: 07/27/13
Posts: 2163
Loc: Outer Banks, NC
That's a lot of rust for 6,000 miles. If you want ACDelco brake parts for your Saturn, there's a good selection and good prices at www.oscaroparts.com. I'm using the ACDelco Professional Durastop rotors on my Ridgeline, and I like them.
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#4728654 - 04/16/18 10:23 AM Re: Brake Rotors - what causes this? [Re: 99Saturn]
MNgopher Offline


Registered: 09/17/02
Posts: 4063
Loc: Lakeville, MN
Lack of use plus rust nets what you are seeing. If you drove it more regularly it would help with keeping the swept surface clean and not corroded. Higher end rotors may help, emphasis on the may...

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#4728669 - 04/16/18 10:37 AM Re: Brake Rotors - what causes this? [Re: 99Saturn]
KrisZ Online   happy


Registered: 12/23/06
Posts: 7507
Loc: Toronto, Canada
With so little driving there is really nothing you can do. The coated rotors will only keep the rust away from the areas not connected by the pads.
Maybe be more aggressive with the brakes when it's dry out? That should at least force full contact.
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#4728733 - 04/16/18 11:19 AM Re: Brake Rotors - what causes this? [Re: 99Saturn]
slacktide_bitog Offline


Registered: 03/20/08
Posts: 6342
Loc: USA
Salt and non-coated rotors crzy

Get new rotors that are coated. Something like Wagner E-shield or Centric Premium.

You may need new calipers, too. Again, use coated calipers like Napa Eclipse or Cardone Ultra.

Are the pads showing a tapered wear pattern?

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