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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHWhat's that on my rotors/discs???
Leading reported evidence
Clean brownish spot
Performed · outcome unconfirmed
No successful repair reported for this finding.
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0
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Performed · outcome unconfirmed · Original poster
-> Third Pic: Front Right Wheel - Cleaned Brownish Spot with a Rag
Leading evidence: 'Clean brownish spot' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Clean brownish spot' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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During that process, any components that are not completely virginal are replaced wit nos parts.
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Suggestion
I think I would take those off, clean the hub, and get new lugs.
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Suggestion
That will be a problem when you have to change a flat.
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22 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Can anybody tell me what's the brownish looking stuff on my rotors/discs? It's only on the front wheels and not on the back wheels. Also, you can wipe it off, so it's not rust (I guess).
- Is this abnormal?
- Should I clean it, if so with what?
- Anything I can do to prevent this?
Thanks!!
-> First Pic: Front Left Wheel
-> Second Pic: Front Left Wheel - Close-up
-> Third Pic: Front Right Wheel - Cleaned Brownish Spot with a Rag
-> Fourth Pic: Rear Wheel - No Brownish Spots
It's the same as what is on your lug bolt, iron oxide. It forms on iron and steel metal objects that are in a natural and unprotected state and in contact with moist or wet environments. When it rains or you just finished washing your car, you will notice it forms rather quickly on your rotors. Drive your car and apply your brakes and it is quickly removed. It has been there on all your cars but maybe you have not paid attention. It's harmless and will come and go. I would however remove your lug bolts and wire brush them and give them a coat of protective primer and paint.
That's the new PCRAB (Porsche Composite Rust Applied Brakes).
Porsche's press release:
"This remarkable technology consists of a lightweight rusted discs with a specially developed composite pad. Each of the front and rear discs has an impressive layer of rust of 0.0911 inches (0.00996 mm). Cross-drilled and internally vented for optimum absorption of moisture, the finished PCRAB disc offers an approximate 50% weight saving over conventional metal equivalents as parts of the disc flake off during driving."
I heard it's good for at least 15 hp.
Seriously, do you drive this car? I don't think my calipers looked like that after about 4 days of ownership. The wheels look brand new, and I can still see tire nubbies!
I just bought this car (10 days ago)... drove it a thousand miles from Kansas City to Charlotte, so it is being driven. This color showed up after washing it yesterday.
As it relates to the wheels looking brand new... Thanks for the compliment... spent about an hour or so cleaning the rims!
the only way to correct the problem is to take the right foot while driving and push it on the small pedal in the middle... the amount of pressure depends on the speed that you are aproaching the object or corner you are cominng to.
the more you use it the less you will notice the brownish discoloration
Happy 4th!
If you wash it and leave it parked, you will feel the "clink" when the car has to break the rust bond to roll.
I'm more surprised about your rusted lug . That will be a problem when you have to change a flat.
I think I would take those off, clean the hub, and get new lugs. Was the car stored where there was a lot of acid, or did someone use a multi-stage chemical wheel cleaner and forget to rinse off the chemicals? AS
Don't buy new ones, unless of course, you're not the DIY type and money has never been an issue. Any old primer and rattle can paint for metal will do. I had some silver wheel paint lying around and did mine, not a perfect factory match but no one would notice but me. They look brand new now, did 'um in less than an hour and put anti-seize on the threads.
Hey, can you buy silver/grey plastic covers like they have on Audi's so I don't have to take the tires off and scratch the paint as I put the freshly painted bolts back on?
Lol, you've been washing that car too much and not driving it enough
First time you hit the brakes, that surface rust will rub right off. All car's do it, but on the porsche's it is just a little more noticable with the big rotors, and easy view of them
dutchie
go to any napa pep boys advance auto etc. its a compound that prevent diemetalic corrsion or when a nut will seize due to exsessive heat. i put on all my lugs on all my cars...
just wipe small bit in the threads of the of the lug
I think you have a more serious problem than you realize. Looks to my trained eye to be rotor mites. Happens mostly on cars that have been in the middle states for any length of time. Latin, rotorus mitus, from the e-coli family. Hard to get rid of. As a living organism they can be eradicated by the fumes of a burning palm frond. Don't put the fire directly under the wheel, but have a certified virgin wave the palm frond near the tail pipes of the car. Glad to help!
That is a "Porsche certified virgin", is it not? I have been given to understand that Porsche certification of a virgin is somewhat more expensive, but it subjects the virgin to a carefully controlled inspection process that assures proper and long-lasting function. During that process, any components that are not completely virginal are replaced wit nos parts. AS
After you wash your car, drive it a bit and use the brakes to dry them. That prevents the problem. If driving in the rain (shame on you!) use the brakes fairly hard just before you garage the car. The heat will evaporate the water before rust can form.
Rgds,
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