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Rusty Discs

Discussion in 'A3/S3/Sportback (8P Chassis)' started by beaker, Mar 27, 2006.

  1. beaker
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    beaker Member

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    [Mar 27, 2006]
    I've noticed that my brake discs seem to be getting a rusty coating if I leave the car sitting unused for a couple of days or more. It goes away when I use the car the brakes make a horrible noise when I first use them, presumably as the coating is being rubbed off. Is this normal? Is it damaging to the brakes in any way?
    #1
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  3. jdp1962
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    jdp1962 Grumpy Old Moderator Staff Member Moderator

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    [Mar 27, 2006]
    Every car I've ever had has done that. Wouldn't worry about it
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  4. Kevint
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    Kevint Active Member

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    [Mar 27, 2006]
    [ QUOTE ]
    Every car I've ever had has done that. Wouldn't worry about it

    [/ QUOTE ]

    Agreed.

    If it's been a wet day the rust can happen after a few hours.

    Kev.
    #3
  5. beaker
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    beaker Member

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    [Mar 27, 2006]
    OK then. I think this happened on my golf as well but its probably a lot more noticable with the s-line wheels.
    #4
  6. marriedblonde
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    marriedblonde Moderator

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    [Mar 27, 2006]

    The discs on mine, and all my previous cars, go rusty from the time I start to wash my car to when I rinse it.

    Don't worry, one of those things

    J.
    #5
  7. oldlaw
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    oldlaw Member

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    [Mar 27, 2006]
    I recently bought a A3 which was quite badly affected with rust,not on the actually part of the disc where the pads touch.but on the part where it bows out and connects to the wheel. I took it to Audi Perth where it looks like they have just resprayed it. It now looks like the rust is starting to come thru again. Anybody had anything similar? It`s on a 05 plate. /ubbthreads/images/graemlins/cry.gif
    #6
  8. SMB
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    SMB New Member

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    [Mar 27, 2006]
    disks suffer a lot of heat from braking and any paint applied at day one soon wears off. Most disks these days are not treated to stop rust, as the braking action wears any coating off most of the disk, you can buy special disks with a special coating but you pay a lot more for them.
    #7
  9. oldlaw
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    oldlaw Member

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    [Mar 27, 2006]
    Looks like this
    [​IMG]
    #8
  10. d3fy
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    d3fy Active Member

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    [Mar 27, 2006]
    same on my 5 month old car. A design feature of Audi to prevent rusting when standing only not for inlife. Get your self a tub of hammerite and give them a lick of paint and do the calipers at the same time, thats what I will be doing when the weather smartens up
    #9
  11. wilko
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    wilko Top Gear

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    [Mar 28, 2006]
    I'll be doing the same as well when it warms up cos mine are going much the same. Will hammerite do the job? What about the colour match? The colour isn't too disimilar to the alloys. Anyone done this before?
    #10
  12. d3fy
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    d3fy Active Member

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    [Mar 28, 2006]
    I have painted Calipers before on the last two cars, first time with Caliper paint, second car with Hammerite. The Hammerite was the best and lasted without any problems the two years I had the car
    #11
  13. imported_hookie
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    imported_hookie Guest

    [Mar 28, 2006]
    Discs get very hot, a high temperature paint is more advisable, if you remove all rust first the coating will last alot longer.

    Oh and try and avoid spraying the contact surface!
    #12
  14. wilko
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    wilko Top Gear

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    [Mar 28, 2006]
    Does anyone have any pics what what parts of the caliper you can and can't paint? Please post um if you have!!
    #13
  15. imported_hookie
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    imported_hookie Guest

    [Mar 28, 2006]
    Avoid the pistons, seals and the nipple!
    #14
  16. d3fy
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    d3fy Active Member

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    [Mar 28, 2006]
    anything rubber stay away from, anything metal paint, so the fronts of the calipers, the sides, the hubs
    #15
  17. cdb2
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    cdb2 Member

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    [Mar 28, 2006]
    You can get special heat resistant bright silver paint at Halfords, used it on a prev car. Think it was safe up to 1000 degrees celcius.
    #16
  18. oldlaw
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    oldlaw Member

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    [Mar 28, 2006]
    Ok guys looks like a trip to halfrauds for some hammerite when the time comes. /ubbthreads/images/graemlins/woohoo.gif I just love me smilies.
    #17
  19. d3fy
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    d3fy Active Member

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    [Mar 28, 2006]
    I really would not bother with the Caliper paint and just go for hammerite, but go with what you are comfortable with
    #18
  20. marriedblonde
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    marriedblonde Moderator

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    [Mar 28, 2006]

    I've painted loads og brake calipers, carries, engines etc all with hammerite and never had a problem with the paint burning Best bit is it's quick, quick drying and looks fine /ubbthreads/images/graemlins/laugh.gif
    #19
  21. steeve
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    steeve Active Member

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    [Mar 29, 2006]
    I generally have always used caliper paint, but I know a few who always use Hammerite and they have never had any problems. I did paint the hubs with smoothrite though and they look pretty good. Better than rust.
    #20

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