Does anyone know what 'bonding' Mercedes uses on their brake disks

[anyweb]

hi, look at these photos of rear brake disks on a w213, they are coated with some grey paint, does anyone know the name/brand of this paint, it prevents rust and after 2 years they still look fresh

https://www.ebay.co.uk/itm/Genuine-...283771&hash=item1eeab879b3:g:Hf0AAOSwJTNb0IIO


cheers
niall

 

[anyweb]

also side question, what is the purpose of the three circular indents in the brake disk face ?

 

[Blobcat]

I guess they could be wear markers

 

[Gazwould]

Any disc , no rust , sorted .

 

[malcolm E53 AMG]

I guess they could be wear markers

They do look about the right depth, if so they should be a good help to everyone

 

[anyweb]

ok if they are wear markers then when i cannot see them any more I should replace the disks ? I still see the 'dots' on my rear disks

 

[Blobcat]

ok if they are wear markers then when i cannot see them any more I should replace the disks ?

Yes

 

[DREAMER NO2]

I use a spray can of ZINCPLATE . Or any good one coat paint like Hammerite.

 

[om613]

It'll just be a single pack grey primer.

 

[onefortheroad]

Those holes dont look overly deep. Youre meant to see 2 lots of pads to a set of discs. Are they not just for balancing the spin of the discs at manufacture ??

 

[davidsl500]

The indents are in the same location on each disk so it can't be for balancing so I would say they are disk wear indicators. Drop a vernier into the hole and if its 1mm deep that would confirm it. Generally a vented disk has allowable wear of 2mm total from new. From the picture, the disk isn't rusty where it isn't painted .....

 

[anyweb]

to clarify things, on my W213 it has these disc from the factory and they still look fresh (no rust), in a country (Sweden) that salts the roads heavily in the winter, so everything rusts,

I don't want my discs looking like rusty crap, the photo above is from NEW discs on ebay, i was just wondering what they coat them with (what type of paint) and of course, why those three circle dots are on the disc surface