Check Brake Discs For Damage - AR42.10-P-0290-01RG

Model 167, 190, 197, 205, 206, 212, 213, 217, 218, 222, 223, 231, 232, 253, 254, 290, 295, 297 with code B07 (AMG - ceramic brake system) 

Courtesy of MERCEDES-BENZ USA

The ceramic brake disk cannot be visually inspected for wear. A wear test can only be performed with the electronic measurement method or by evaluating the wear indicators using the test films (1).

1. Check the inside and outside of the brake disks for damage.

   The following types of damage may occur: Chippings on the friction surfaces (A)

   Chippings on edge of brake disk ring (B)

   Chippings on perforation holes (C)

   Courtesy of MERCEDES-BENZ USA

   Chippings on the friction surfaces (A) 

2. Prepare test film (1) with dimensions 20 mm x 20 mm (400 mm2).
3. Check chippings on friction surfaces (A) with test film (1).

   Chippings on the friction surfaces (A) can occur because of thermal stresses. Per brake disk, max. 3 chippings up to a size of 400 mm² and a depth of max. 2 mm are permissible.

   Chippings on edge of brake disk ring (B) 

4. Check chippings on edge of brake disk ring (B).

   Chippings on the edge of the brake disk ring (B) can occur because of thermal stresses or collisions. A maximum of 3 chippings of the following dimensions are permissible for each brake disk:

   Length in circumferential direction max. 25 mm

   Width in direction of friction surface max. 8 mm

   Depth max. 3 mm

   Chippings on perforation holes (C) 

5. Check perforation holes (C) for possible chippings.

   Chippings on perforation holes (C) can occur because of thermal stresses. They are permissible up to a length, width and depth of 3 mm in each case.