Chassis
generic / SAE
C0266
Active Brake Booster
The brake control module has detected a fault in the active (electric or vacuum-controlled) brake booster. Active boosters are used by emergency brake assist and adaptive cruise control to autonomously build brake pressure.
SystemChassis
Typegeneric / SAE
GroupC0
Range / number2 / 66
Possible causes
- Active booster motor or solenoid failed high
- Vacuum supply weak (vacuum pump or hose fault) medium
- Wiring or connector fault low
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 400–2500 €
- Estimated time: 1–5 h
- Component: active brake booster
- Component: brake control module
- Component: vacuum pump
Sources
References
sae:J2012