Corrosion inside rear brake disks

dezzy · Post by **dezzy** » Tue Sep 19, 2006 8:41 am

I've got corrosion on the inner edge of my rear brake disks. Not on the disks themselves where the brakes are applied, but just inside where they join onto the wheel.

Should I be concerned? Wear and tear? Or is something wrong?

Cheers,
D

mac · Post by **mac** » Tue Sep 19, 2006 9:06 am

They all do that - exposed to the worst of the elements - the only reason it doesn't happen to the rest of the disc is because it's cleaned with the pad.

HTH

Mac

Post by **Shug** » Tue Sep 19, 2006 9:19 am

^

What he said - also the rear pads sweep a smaller area than the fronts, so there's a larger bit of the disc that gets rusty. Some aftermarket discs (like EBC turbogrooves, for example) have a zinc passivate coating on them that keeps any unswept area free of rust for a good while (unless you 'Wonder Wheels' them!)

The discs are just cast iron after all - no need to worry.

alicrozier · Post by **alicrozier** » Tue Sep 19, 2006 9:43 am

I think they were painted (or coated) for a while...but obviously cost too much.

Sanjøy · Post by **Sanjøy** » Tue Sep 19, 2006 10:11 am

Never seen a spot of rust one on my disks

Post by **Shug** » Tue Sep 19, 2006 10:15 am

Sanjoy wrote:Never seen a spot of rust one on my disks

Yes, but luckily you drive miss Daisy, or they would go bang!

dezzy · Post by **dezzy** » Tue Sep 19, 2006 10:58 am

Cheers guys. Advice much appreciated!

D

Michael · Post by **Michael** » Wed Sep 20, 2006 9:56 pm

ive bought some rust curer to change the unsightly orange colour to black.

Great thing is it is a chemical bond to the rust. paint would never last but this will