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Author Topic: Keeping brake discs from going rusty  (Read 1818 times)

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MW-Omega

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Keeping brake discs from going rusty
« on: 22 February 2018, 01:57:44 »

Any good tips for keeping brake discs from going rusty on cars that are left standing?
I have a number of vehicles inc 3 omagas which i alternate, which means that some are left standing.
It annoys me that even after a few weeks you can see rust on the discs through the alloys.

For obvious reasons, i am reluctant to WD40 them etc.......


 
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Enceladus

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Re: Keeping brake discs from going rusty
« Reply #1 on: 22 February 2018, 03:45:15 »

The original GM discs are painted with a primer like coating on the unswept areas. That stops the outer circumference rusting. Nothing will prevent surface rust on the swept area, except using the car which will quickly clean the discs. You can get aftermarket discs that are coated. They tend to be more expensive than the vanilla versions.
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cam.in.head

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Re: Keeping brake discs from going rusty
« Reply #2 on: 22 February 2018, 09:15:07 »

even after a few weeks !.    even after a few days i wish mine lasted a few weeks !.  i know what you mean thou. and yes moving them seems the only way to keep them clean.at least its only surface rust that hasnt started to eat in. i think part of the reason is the metal quality is not as good as it used to be and some discs will rust worse than others . dont know what make they are because they were on car when i bought it but one of mine has some discs that no matter how long you leave them and how much surface rust seems to appear on first drive they always ckean ip to a perfect 100% mirror shiny finish .they have been on the car for 25 years to my knowledge and were not new then. wish i knew what make they were !
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Andy B

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Re: Keeping brake discs from going rusty
« Reply #3 on: 22 February 2018, 09:18:49 »

My Merc's discs are visibly rusty  when left just over night
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robson

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Re: Keeping brake discs from going rusty
« Reply #4 on: 22 February 2018, 10:05:29 »

agree about the Merc .a friend has one and left over night the discs are rusty.
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steve6367

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Re: Keeping brake discs from going rusty
« Reply #5 on: 22 February 2018, 12:28:10 »

Any good tips for keeping brake discs from going rusty on cars that are left standing?
I have a number of vehicles inc 3 omagas which i alternate, which means that some are left standing.
It annoys me that even after a few weeks you can see rust on the discs through the alloys.

For obvious reasons, i am reluctant to WD40 them etc.......

A quick emergency stop will resolve that for you once the car is in use  :y
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cam.in.head

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Re: Keeping brake discs from going rusty
« Reply #6 on: 22 February 2018, 15:56:36 »



For obvious reasons, i am reluctant to WD40 them etc.......
[/quote]

Yeah !    Most definately a no no.....
I have researched this myself and its a problem i think we have to live with .short of carbon fibre or stainless ( which i dont think would be suitable even if you got some made up ? ?)its a feature of steel / cast brake discs unless anyone has any ideas !that weve not thought of ?
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laney101

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Re: Keeping brake discs from going rusty
« Reply #7 on: 22 February 2018, 22:46:43 »

Buy some zinc wurth primer in aerosol and spray outer edge and bell of a new disc once decreased.. don't worry about getting paint on face.... once you drive a mile it will wear it off face and leave zinc coating in fins of discs and on bell .. won't rust then.. I always do I on my cars done it few weeks ago on my omega looks good and makes discs last better
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robson

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Re: Keeping brake discs from going rusty
« Reply #8 on: 23 February 2018, 09:50:04 »

What size do you decrease them to before painting :y
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cam.in.head

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Re: Keeping brake discs from going rusty
« Reply #9 on: 23 February 2018, 10:53:43 »

Some come already painted/coated and the ones that dont (not always the cheaper ones) are definately worth painting before fitting as they do look so much better but like the op says its a pity theres not a way to stop the actual braking surface from rusting.
Yes we know they clean up but only within reason. If a car is left parked for over a certain time then the rust starts to eat in and will never clean up. For those who have a few cars or ones that are used infrequently and dont have them undercover it is a problem.
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Chazza12

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Re: Keeping brake discs from going rusty
« Reply #10 on: 24 February 2018, 04:36:42 »

zinc spray and cook them in the oven for 2-3 hours at 210-220c,  then let them cool down. did it with a mondao years ago, make sure they hang and not flat on the shelf as will make lines. 5 years never rusted up.  similar to this. https://www.ebay.co.uk/itm/2x-Zinc-Spray-Grey-Primer-Anti-Rust-Heat-Resistant-350-c-Galvanise-Metal-Steel-/121856500282
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cam.in.head

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Re: Keeping brake discs from going rusty
« Reply #11 on: 24 February 2018, 09:56:34 »

my boss ued to use that. he took his discs off his porche every year and had me spraying and baking them. just the hubs thou.nothing on the actual friction surface !.
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