Rust on Rotor, is it normal?
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  1. #1
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    Rust on Rotor, is it normal?

    Is it normal for the rotor to start rusting after 5 months?

    I bought a pair of rear rotors 5 months ago. When bleeding the brakes today I saw significant rust on both the rotors.

    Here are a couple of pics:






    Here's my thread of 5 months ago.
    http://www.passatworld.com/forums/42...-1-8t-gas.html

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    Super Stealth Retired Moderator JayTheSnork's Avatar
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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.

  4. #3
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    Thanks Jay. Yes, the top hat is rusted.

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    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.


  6. #5
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    I painted mine (aluminum paint over primer), they stay nicer that way.

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    Quote Originally Posted by ylwagon View Post
    I painted mine (aluminum paint over primer), they stay nicer that way.
    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?

  8. #7
    Motel Room Moderator VAGguy's Avatar
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    yes, hat area only. figure 1/2hr plus prep and paint time......worth it to me

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    Quote Originally Posted by mikefl View Post
    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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    Motel Room Moderator VAGguy's Avatar
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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.

  11. #10
    murdered out Jetta, er, B5 Passat mrgreek2002's Avatar
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    My rotors had rust like that too, I had them sanded down and painted black 3 months or so ago.

  12. #11
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    Yes it is normal.

    Paint em or buy the coated discs.

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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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    If you think that is rusty you should see how the Japenese cars rotors look :-)

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    Quote Originally Posted by VWs4Ever View Post
    If you think that is rusty you should see how the Japenese cars rotors look :-)
    Or low-end GM cars for that matter!

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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?

  17. #16
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    I see a lot of DD cars that have rotors with little to no rust... You can't tell me this kind of rust is normal...

    Just changed mine recently and they are rusting to hell like this as well.

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    Quote Originally Posted by mikefl View Post
    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.


    .

  19. #18
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    usually china made rotors rusts like that.
    btw where are yours made?

  20. #19
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    Quote Originally Posted by corradog60stage4 View Post
    1. Usually china made rotors rusts like that.
    2. btw where are yours made?
    1. It has nothing to do were the rotors is made !!

    2. My Zimmerman rotors are Made In Germany !



    FYI: In fact has a rotor with higher carbon content better brake capabilities !


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  21. #20
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    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?

  22. #21
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    Seems like a lot of work for something that IMO should not happen with good materials. Either way it's the last time i'll buy my rotors at Autozone... Maybe i'll try a little steel wool followed by primer/paint on my current ones since they are like new..

  23. #22
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    Anyone ever tried Grill paint? I know VHT makes a high heat one just for this,but would grill paint take the heat?

    To the OP, I've seen rotors come out of the BOX with more rust than that.

    AJ

  24. #23
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    centric premium rotors


    electrodeposited coating on non-contact surfaces

  25. #24
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    Quote Originally Posted by ylwagon View Post
    i painted mine (aluminum paint over primer), they stay nicer that way.
    x2

    I used engine paint.

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