Brake disc thickness

[reflexboy]

Guys, I think my brake discs are coming to their end of their life and I cannot find the minimum thickness at which they should be replaced. I have wire brushed the hub and cannot find any marking there or on the edge of the discs. Any idea where I can find such info please? If anyone has access to this kind of would be very much appreciated too. It's a 2011 E350 CDi Sport 125 Edition and the vin is: WDD212023A514942. Many thanks.
It has the drilled front discs which I think MB refer to as the AMG brakes.

 

[ash59fifty-uk]

General rule of thumb is seeing if a lip has been produced on the outer edge, if there's a lip then they need replacing

 

[reflexboy]

General rule of thumb is seeing if a lip has been produced on the outer edge, if there's a lip then they need replacing

yep, fair comment, it's just I would like to know the official figure as I have a FOC service coming up which I negotiated to include any items outside of the normal service excluding damage caused by the driver. I would like to ensure what is needed is done at this service due to the shocking way the dealer has treated me previously. Just want to get my facts correct.

 

[ash59fifty-uk]

I see, you done very well there getting a service and brakes done on a freebie! There are more knowledgable people on here I did see a similar thread earlier with some figures

 

[hotrodder]

Any wear lip on the disc can make things look more worn than they are as corrosion (adding oxygen) makes things bigger i.e. if the wear lip is rusty it can measure up thicker than a new disc

Vented discs typically have a min thickness 2 - 2.6mm less than new dimensions and it's not (or didn't use to be) uncommon for MB to spec both a service limit at 2mm of wear as well as an absolute wear limit although with cross drilled discs a blanket 2mm is probably more common as the price for "sporty" looks is discs that are more prone to cracking

Look up some brake discs for your car and most listings include min thickness numbers as well as new dimensions for example Brake Disc 0004211112 OEM Part Number