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Thread: Rusted Discs.

  1. #1
    Regular Member Brocks's Avatar
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    Default Rusted Discs.

    OK I spent a few hours cleaning and waxing the car. One thing is really bugging me.

    I used Megs wheel cleaner to get he alloys nice and shiney with a megs whell brush (now busted!). However I always end up with rusty discs at the end of the cleaning process. The wheels look great, the painted caliper come up great too but the discs spoil it.

    Comments on why and how to sort this would be helpful

  2. #2
    [Ex]Admin Duncan's Avatar
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    Why is simple. It's due to water just sitting on the discs for a while and reacting with the surface metal. You'll see the same when you come to your car in the morning and it's been raining overnight.

    Solution - drive it for a bit and it'll clean off that rust as the pads bite into the discs. DON'T apply ANY products whatsover to the discs (apart from solvent type brake cleaner) as they may leave behind thin films of stuff that will drastically reduce your braking power.

    HTH

    D

  3. #3
    Regular Member Brocks's Avatar
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    Cheers D.

    The disc seam clean and Shiney before I wash the car. I've seen disc rust up so quickly that they're rusty by the time I rinse the car down!

    I don't actually apply productes to the discs, There may be splatter from the wheel brush I suppose.

  4. #4
    [Ex]Admin Duncan's Avatar
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    Quote Originally Posted by Brocks
    The disc seam clean and Shiney before I wash the car. I've seen disc rust up so quickly that they're rusty by the time I rinse the car down!
    Yep, that's normal - same here. I just take the car for a spin after I've washed it to clean them up.

    D

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    Regular Member e.shine's Avatar
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    its the acid in the cleaner if you buy a weeker cleaner it wont do it but not as good cleaning power it cleans all the muck off the disk aswell as the wheel as soon as you use the brakes agiain it will disapear though no harm done though hope this helps

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    Default reason for disc rust

    The reason is that since asbestos was taken out of brake pads, discs have been subject to wear by harder, part-metallic pad material, so the original surface gradually wears away. What compounds the problem is that rear discs do very little work at low speed so surface corrosion is not \'cleaned off\' in the normal course of braking. The same will happen to the front discs of acardriven and parked in damp conditions and not used frequently. One answer is to have an engineering shop \'skim\' the corrosion, grooves or \'warp\' off the discs, and an expert machinist can make them \'better than new\'. But since this process can cost as much as new discs, new discs are usually fitted instead.


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    Regular Member Harry's Avatar
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    Quote Originally Posted by Duncan
    I just take the car for a spin after I've washed it to clean them up.
    and then wipe the wheels down again when you get back because you get fresh new brake dust on 'em.

    it's a vicious cycle!!

    has anyone been sad enough to use plastic brake disc covers, you know the ones, they go in between the hub and the wheel and the brake dust can't get to your rims - come on...confess! we won't take the mick......not much!

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    Regular Member AndrewTi's Avatar
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    In a previous incarnation, I worked in a car accessory shop, **** hours, **** money, but a reputation as a shop as the best in town for expertese which was nice!! Anyway, I digress, we had a rack of disc covers and in all my 18 months there we never sold a set! I know as I did the stock orders!!

    In relation I sold three 'GOODMANS' signs, you know the ones that usually say 'KENWOOD' or 'ALPINE' that went in the back window!!

  9. #9
    [Ex]Admin Duncan's Avatar
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    Quote Originally Posted by Andrew's SRi
    .....you know the ones that usually say 'KENWOOD' or 'ALPINE' that went in the back window!!
    Ah, you mean the ones that say "Come and smash my window to take my snazzy ICE install and then discover that it's still the standard HU and the sticker was just for show!!"

    OR

    "Come and smash my window to take my snazzy ICE install and then get away with a bunch of nice Kenwood/Alpine gear!"

  10. #10
    Regular Member AndrewTi's Avatar
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    That's the one!! I actually thought they were a bit sad at the time, but now I realise they were an absolutely genius idea! Whack one of those on your car filled with Alpine, no-one would ever touch it!!!! More secure than having a hungry, rabid Rottwieler sat in the seat!!

    Anyway, sorry to go off topic Brocks!!

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