Notes on evaluating brake disks - AH42.10-P-9406-07RQ

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MODEL 190, 197, 205, 212, 217, 218, 222, 231 with CODE B07 (Ceramic brake system)

Fig 1: Identifying Chipping on Brake Disks

Courtesy of MERCEDES-BENZ USA

Always check the inside and outside of the brake disks for damage.

The following types of damage may occur:

Chippings on the friction surfaces
Chippings on edge of brake disk ring
Chippings on perforation holes

Chippings on the friction surfaces
Chippings on the friction surface can occur due to thermal stresses. A max. of 3 chippings up to a size of 400 mm 2 and max. 2 mm depth are permissible for each brake disk.

The smaller chippings shown are normal, they have no influence on brake power or durability and are therefore not a problem.
Chippings on edge of brake disk ring
Chippings on the edge of the brake disk ring can occur due to thermal stresses or collisions. A max. of 3 chippings of the following dimensions are permissible per 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
Chippings at perforation holes can occur due to thermal stresses. They are permissible up to a length, width and depth of 3 mm in each case.

Fig 2: Identifying Inside/Outside Of Brake Disks For Damage
Courtesy of MERCEDES-BENZ USA