I received the dreaded red light brake errors on my instrument cluster, so I was preparing for the worst (broken SBC computer). When I scanned for errors, fortunately it only showed a faulty brake light switch.

Partnr: 0015454009 / A0015454009

Reduced braking power! Start engine!
ESP Defective! Visit workshop!
Reduced braking power! Depress brake pedal fully!
MB iCarsoft v3.0: SBC Brake Light Switch error (C261E) / State: Historic Hydraulic Fault Or Brake Light Switch Faulty
Values with a lightly squeezed brake pedal
New brake light switch A0015454009 / 0015454009
Location of the brake light switch
New and old brake light switch