"Rust" looking spots on wheel drum?

[DoubleT]

Just had my 2008 Mazda 5 for a few days when i noticed a few "rust" looking spots on the wheel drum. Comes off easily. What is this stuff, I know it's not rust and I have seen it on other parts of my previous cars.

 

[coolmazda5]

Wheel brake disc rotors, right? It is normal and goes away quickly after quick wear. Something like this below (not my pic, but good sample)

 

[blacktalon13]

Surface rust, it'll go away as soon as u step on the brake a few times

 

[DoubleT]

Thanks! The pic shows the situation spot on (no pun intended)!
Speaking of rust, any of you folks have an opinion on paint & rust protection?
I only got the fabric protection and a bug shield on my 2008 M5 GS so far. Not too late to add the P & R protection yet if I'm convinced.

 

[NCZ13]

you dont need it.

just have the car regularly detailed by a detailer who knows what they are doing.

 

[DoubleT]

you dont need it.

just have the car regularly detailed by a detailer who knows what they are doing.

Even with with salt infested slush we Ontarians go through for four months?

 

[NCZ13]

undercarriage rust protection: yes

there isnt a magic paint product that protects paint from rust. You will just end up paying 500 dollars at a dealership for a sealant application that doesnt do anything.

 

[DoubleT]

Now that you mentioned that, I have done that with most of my cars but not all of them had the paint protection. I usually keep my cars for 7 to 10 years and tend to forget what I had done with them including the wife's many cars.
Will do that with the M5 for sure.