Mercedes-Benz C230 2003 — technical service bulletin
Bulletin 424628 · NHTSA communication 10002200 · issued Jan 22, 2004
Technical service bulletin
communication type
Service Brakes, Hydraulic
component
2003
model years
1
vehicle entries
Official summary
Buzzing / droning noises during pressure buildup of sbc system. *tt *mj
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.