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yes, if you mean the rust on the top hat.

it's amazing that you still have some of the original crosshatching finish on the rotor face, as well.
 

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Discussion Starter · #4 ·
Just for info, below us my front rotor. It's the original one, I bought the car in 2001 Dec, I am at 125600 miles currently. I still have the original brake pads on the front.



Below is the pic of the old and new rear rotor that I bought it 5 months ago.
The old rotor was the original one on the car.

 

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yes, hat area only. figure 1/2hr plus prep and paint time......worth it to me
 

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That's a great idea.
I take it this is to be applied to the top hat area only, correct?
Is it worth the effort to apply the primer even after the top hat has started getting rust?
Actually I painted with the rotor in place. First the whole disk/caliper area got a careful cleaning, then I removed the caliper from the frame and moved aside. After masking as needed, I steel wooled the top hat until shiny, the primer and aluminum paint should stop further rusting. Next wiped with alcohol, then a coat of primer. When dry, the aluminum paint went on: have someone turn the rotor while you spray, unless you can do both at the same time, for a smooth finish. There will be overspray on the rotor- don't worry, this will wear off quickly.
 

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^That's a good way to contaminate the pads. Just tape up the rotor face to prevent overspray and do it off the car.

If there is a next time, I suggest the Meyle coated rotors. Replaced last year and they still look like new on the hat and edge.
 

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For OEM Mercedes Benz rotors they come in primed right from the factory. Alot of people tend to ask if that is normal, or if they are supposed to remove the primer. The techs in the shop do not remove the primer, they just tend to let the pads wear the primer off. It does not hurt the pads or rotors.
The one thing I do notice is that the OEM MB rotors still look clean and primed months after they have been installed.
 

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*ROTFL* You Florida guys crack me up..."Look at that big pothole!" *Points to a 1/8" scuff off the road* "Look at how rusty these rotors are!" *Posts pics of slightly surface-rusted rotors*...

My rotors look like that after they've been sitting overnight! Just over a year ago I bought a set of Balos (BMW guys swear by them) just to get me by for a year or so. I was just chipping 1/16" thick huge rust pieces off the top hats! "Should my rotors be rusting like this?" Don't make me fly down there just to smack you... ;)

I've got new Brembos coming all-around, and my plan is to paint them. Any lines on a good paint that doesn't inhibit heat dispersion?
 

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Is it normal for the rotor to start rusting after 5 months ?
YES !
It depends on many factors....
* The carbon content in the cast iron --> The higher content of carbon in the cast iron the faster it rusts !
* The humidity in the air were you live.
* Winter or summer.
* If you live near the sea coast they will rust quicker.



I have Zinc electroplated my Zimmerman brake discs on my Passat to avoid rust/corrosion.


.
 

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Discussion Starter · #20 ·
Using aluminum primer/ paint on the top hat should reduce the rusting.
I plan to steel wool it and apply primer and paint. But I am just too busy with more pressing issues on the car.

Moderators, can this be added as an optional step in any brake pads/rotor replacement DIY?
 
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