Rust spots on disks

I took my 2 month old Sport out for a run last week, first time out on wet roads, i gave it ( i thought ! ) a good wash & clean afterwards, but have just checked it this morning after a few days was horrified to see rust already appearing on the discs.

Would appreciate advice on what to apply to get rid of this, have just ordered some stuff from Muc-off including a disc brake cleaner, should this do the trick, as keen to keep the bike looking nice & clean !

If it's a Suzuki then enough said really. My new SV had rust on the disks after a month! As long as the keep it regularly clean and ride it a bit it shouldn't be too much of a problem. Just gently test your brakes early in your ride so should you need them they don't have to scrape the layer of rust of before working. This should be done on every ride though really.

[Viney]

Discs are steel, and steels sole purpose in life is to rust! Really dont worry about it, its just surface raust and nothing more, and will disapear with the 1st application of the front brake.

Yup it is normal and they probably are not rusted that bad anyway compared to a car.

My SV's disks went like that with a few rust spots but if I left my car for a week after using it in salt the entire disk would be orange and I'd have to use a lot of revs to pull away followed by a clunk as the seized brakes came unstuck!

I can only assume they use a different grade of steel on bikes as I have always found car disks to rust more.

[northwind]

It's actually a good thing, believe it or not... You can make discs that won't rust unless stored in the sea, but they're rubbish at being brake discs. Ductile iron, on the other hand, rusts overnight but works very well as a braking surface. It's all about striking hte right balance. My Braking and Galfer discs both rust too, put it that way And should see how EBC Prolites rust.

You can clean it off with a scotchbrite pad or similiar- Homebase sell the 3M metal polishing pads, ideal.

I find braking works best... mine have loads of rust on them at the moment.

Although its been quite mild recently, there is still plenty of our good old freind salt out there. It's perfectly normal for discs to show surface rust this time of year. Don't worry, it used to happen to all my bikes whatever the make. The first easy application of the brakes and its gone anyway.

Cheers everyone for the feedback, maybe not as bad as i first feared, but I now appreciate how much mess salt can make to a bike

Originally Posted by Dee4Life

Cheers everyone for the feedback, maybe not as bad as i first feared, but I now appreciate how much mess salt can make to a bike

No salt around here - yet, and my Daytona's discs have rust. As Viney says, it's only surface rust and nothing to fret about.

Originally Posted by northwind

Ductile iron, on the other hand, rusts overnight but works very well as a braking surface.

Overnight? The disks on my car will develop rust within a couple of hours of washing it!