Check Brake Disks For Wear - AR42.10-P-0264-01RG

Model 190, 197, 205, 212, 213, 217, 218, 222, 231, 253, 290 with code B07 (AMG - ceramic brake system) 

	Check brake disks for wear
	Risk of injury  to skin and eyes from laser beams	Never look directly into the laser beam. Do not attempt to suppress natural reflex of closing the eyelids. Avoid direct skin contact with the laser beam. If damage to the eye is suspected, consult an eye specialist immediately.	AS30.30-Z-0001-01A

Courtesy of MERCEDES-BENZ USA

Before starting the measurement, check calibration of measuring equipment (2) using supplied test plate (2.1). Make sure that no external electromagnetic fields are present in the area of use of the measuring equipment (2). Use measuring equipment (2) within the specified operating temperature range only.

The measuring equipment (2) contains a class 2 laser. It is essential to observe the safety information in the manufacturer's operating instructions.

1. Switch on measuring equipment (2) and place into both positioning openings of test plate (2.1).

   The displayed measurement value must match the reference value (2.2) on the adhesive label attached to the test plate (2.1). A deviation of ± 2.0 units CQ (Carboteq value) is permissible. If the deviation exceeds ± 2.0 units of CQ (Carboteq value), perform a reset procedure on the measuring equipment (2) in accordance with the operating instructions. If the reset procedure of the measuring equipment (2) fails, it must be calibrated. For proper calibration, send the measuring equipment (2) to a service center that is certified by the manufacturer.

2. Position measuring equipment (2) absolutely flush with the outer edge of the brake disk (1).
3. Move measuring equipment (2) along the curved radius of the brake disk (1) until the laser beam is aligned with the measurement marking (3) engraved on the brake disk (1). The brake disk (1) must be dry during the measurement. Otherwise, there may be deviations in the measurement result. The displayed value must be between the new value (4) and wear values (5) attached to the brake disk (1). If the wear value (5) is undershot, replace the brake disk (1).If only one brake disk (1) is replaced on the front or rear axle because of damage, a wear value of 66 percent of the new value (4) applies to the second brake disk (1) on this axle. If this value is undershot, also replace the second brake disk (1) of the axle.

   It is not necessary to remove the brake caliper. Only measure the outside of the brake disk (1). The outside is subjected to a higher thermal load and therefore, with regard to the Carboteq limit value, is always more critical than the side facing the vehicle.

4. Freeze the display of the measuring equipment (2) in order to be able to read off the measurement value even after the measurement.
5. Turn brake disk (1) and perform a wear measurement at the remaining engraved measurement markings (3) as described in operation step 2.

The measurement does not replace visually inspecting the brake disk (1) for damage.