[ether_joe]

hey dudes



well the shiny new Porsche solid discs I put on a coupla months ago are showing some rust after some rains here in the bay. The clamping surface is shiny and silver. However the hat around the hub is yellowed.



Should I scrape/sand it off treat it somehow? If so treat with what?



Is this a manufacturing defect? Should I be looking for a gratis swap from Paragon?



many thanks in advance. . .

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[apex]

it's been suggested in the past that the hubs get painted or they'll rust.



968 net used to have some chatter about this topic.

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[jpk]

I just replaced all four rotors on mine. I painted the hats using a high temp ceramic laced spray intended for exhaust components (I think it was Krylon, but don't recall offhand).

So far, so good. I still see rust on the braking surface (it seems to form in minutes after washing the car) but that quickly goes away the first time the brakes are used.

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[SILVY968]

The same thing happened to me. When Porsche made the units they painted the inside hub so that it did not rust. When you get them from " an OEM German manufacturer" they are not painted.

Brush off the rust and use hi temp silver or aluminum colored paint to paint the hub.

The rust on the brake surface is normal, I get that every time I wash the car. After the first time you use the brakes the shine comes back.

Brian

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[ether_joe]

ok thanks.



yeah bummer that they don't come from the factory that way. . .

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[Jason Judd]

If you're worried about the rotors, I've got an easy fix...



Take the car out for a short spin around the block and apply the brakes a few times...Presto, no more rust on the rotors!!



They're steel, and will rust up when not in use...A short application of the brake pedal will always fix 'em!



Jason

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[ether_joe]

thanks, it's the rotor caps though - the brake surface is as you say, easily scraped off

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[968 Cab]

easy fix - take the rotors off, get a sheet of cardboard (any big box) and cut a circle out that allows you to slip it over the "hat". Lightly sand off the rust, then wipe it all with a little thinner. Allow to dry and just apply a few light dust coats of high temp "alum" or light grey (some OEM rotors like MB use a very light grey). Let it dry and voila, no rust.



Done this many times on MB, Porsche, etc. Works like a charm. Best to do when they are new though. Hope this helps.

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[Anchorman]

I've done the paint routine on two sets of rotors - and haven't been pleased with the result yet. Why doesn't Zimmerman (and/or others) simply provide new rotors with the "hat" already protected? For them, it should be easy.

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[ether_joe]

[quote name='Anchorman' post='27762' date='Nov 9 2006, 07:05 AM']I've done the paint routine on two sets of rotors - and haven't been pleased with the result yet. Why doesn't Zimmerman (and/or others) simply provide new rotors with the "hat" already protected? For them, it should be easy.[/quote]





yeah that's what I was thinking.

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[Bob Kovacs]

[quote name='Anchorman' post='27762' date='Nov 9 2006, 10:05 AM']I've done the paint routine on two sets of rotors - and haven't been pleased with the result yet. Why doesn't Zimmerman (and/or others) simply provide new rotors with the "hat" already protected? For them, it should be easy.[/quote]

The problem could be that new rotors ship with a light coat of oil to prevent rust. Unless you clean the oil off (which you're supposed to do with new rotors but many people don't bother), the oil will prevent paint from sticking. When you get new rotors, always wash them down with a degreaser. Then paint the hat portion if you want to avoid rust. I use brake cleaner for the degreaser.



--Bob

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[Anchorman]

Good points, Bob. However, if the new rotors were shipped with the "hats" already painted with a rust-proof finish, that finish also could be resistent to degreaser. On my current set of rotors, I degreased, and then degreased again. I had large pieces of cardboard with a center hole so that I could paint the "hat" without painting the rotor. And, I applied several (4 or 5) coats of paint. The result, after several months on the road, is better than my first attempt but still not nearly what should be possible if the manufacturer did it. Let's "bury" Zimmerman with emails and maybe they'll get the hint.

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