The brake discs installed on the front axle may be too small (in diameter and thickness) and would not sit symmetrically in the brake calliper.
As a result, the brake lining can wear out and a gap between the piston and the sealing ring can be formed, allowing brake fluid to leak out.
This will impair the braking performance, increasing the risk of an accident.
The Mercedes-Benz C-Class models affected by this recall were manufactured between 13 September 2018 and 6 November 2019.
Mercedes recall code: 4290201
Source: Rapex Alert 26/2020 A12/00902/20