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Old 01-24-2002, 10:54 PM   #1
JSTFERFUN
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Member#: 14582
Join Date: Jan 2002
Location: San Diego, CA
Vehicle:
2002 WRX
Black

Exclamation brake rotor scored

my new WRX (<1,000 mi) has obvious scoring of the front brake rotors. Not only are they visible, you can feel ridges as you run your finger across them.

I started looking at other car's disk brake rotors and sure enough, they were smooth as glass.

I went to the dealer at lunch time and the service tech kind of brushed me off and said "oh we get that one all the time. The factory sprays the brake shoes with a coating before shipping to prevent rusting. This is what causes the score marks. But they are no problem and don't effect brake performance."

Did the service tech give me the straight scoop?
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Old 01-25-2002, 12:53 AM   #2
SubeTek
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Chapter/Region: RMIC
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Yes, the tech did give you the straight scoop. Subaru sent out a bulletin about this. It's a coating called DaChromet, and it will wear off within a few thousand miles, at least that is what subaru states. It shouldn't cause any problems brake function wise. I know it looks sort of bad, but i haven't seen any prolonged problems from this. Hope this helps.

Bret
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Old 01-25-2002, 12:58 AM   #3
JSTFERFUN
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Thanks Bret!

Good info. I feel better.

Eric
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Old 01-25-2002, 02:07 AM   #4
ANZAC_1915
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Location: Redmond, WA, USA
Vehicle:
2008 Forester XT
Steel Gray Metallic

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Actually, the stock pads are very aggressive and at 6,000 miles I was starting to get VERY bad grooving, visible and very deep grooving (as opposed to the visible "marks" you can see which go away pretty quickly).

On my new car, I installed the 4 pots immediately. Almost any other pad will not cause the grooves.

So keep an eye out for them at 5-6k ish.

Glenn
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Old 01-25-2002, 04:48 PM   #5
TerenceT
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Default i hit 9k

and the grooves are still there, the rotor surface is uneven and on top of all these, there are rust on the rotor center hub
rear rotors are smooth as they should be
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Old 01-25-2002, 04:58 PM   #6
Shaggee
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Just wanted to state that i had really groovy rotors since i bought the car, But i just went out to see if i still have them and nope almost all gone. The Left one is completly gone and the right one is almost the same. So i guess maybe subaru is telling the truth??
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Old 01-26-2002, 01:24 AM   #7
scott_gunn
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I started off with really groovy rotors. At 15k they have smoothed out. The rotors will rust very quickly, the rust should be scraped off next time you go driving.
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Old 01-26-2002, 10:29 AM   #8
gtguy
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Imagine that...Subaru telling us the truth.

This board cracks me up sometimes! Mine had the groove at about 1K, and by 5K, it had gone away. No problems, no worries.

Kevin
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Old 01-27-2002, 01:19 PM   #9
JSTFERFUN
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Location: San Diego, CA
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2002 WRX
Black

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Actually, I found this board to be very helpful. As a first time Subaru buyer, I am naturally cautious. Also, after buying numerous new cars over the years I have had to deal with several warranty issues and service techs (VW was the worst, Honda the best, so far).

I appreciate the chance to get feedback from others who are going through the same process as me (on exactly the same vehicle!) however flawed the responses.

So it seems that the rotor scoring is "no problem, no worries". OK, but I'll keep an eye on it. The rest of the car is awesome, so that helps.

Thanks to i-Club for providing these forums!
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Old 01-29-2002, 04:18 AM   #10
Lawndart
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Location: Vancouver / Portland Area
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Default Brake rotor scoring

Scoring and grooving of the break rotors usually indicates too much metal in the break pad compound during fabrication, or an extremely aggressive compound. I checked out dachromet and it is normally used as an anticorrosive plating on fasteners such as screws, nuts and bolts. I am not sure what Subaruís rotor break in period is, but after break in you should find a uniform polished appearance with no cracks or grooves. Check your owners manual for specifics.
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