Mercedes-Benz Warning Message
“Service Brake System”
The Mercedes brake control module has detected a fault in the braking system that compromises stopping ability. This may involve the ABS, ESP, or hydraulic brake assist systems.
critical severity
Common Causes
- Brake fluid level critically low
- ABS wheel speed sensor failure
- Brake booster vacuum leak or electric pump failure
- ESP/BAS control module fault
- Brake light switch malfunction
Immediate Action
Do not drive at highway speeds. Braking distance may be significantly increased. Schedule immediate service. If brakes feel spongy or unresponsive, stop driving and tow the vehicle.
Typical Repair Cost
$400–$2,500