Chassis
generic / SAE
C05D5
Brake Master Cylinder Cut Off Valve
Fault on master cylinder cut-off valve — used in brake-by-wire systems to isolate the master cylinder during normal electric boost.
SystemChassis
Typegeneric / SAE
GroupC0
Range / number5 / D5
Possible causes
- Valve stuck or coil failed high
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: 2–6 h
- Component: master cylinder cutoff valve
- MIL / check engine light
- drive cycle required
- limp mode possible
Sources
References
sae:J2012