Chassis
generic / SAE
C05AC
Brake Blending Separation Valve Stuck Closed
Brake blending separation valve stuck closed — regen and hydraulic circuits cannot be isolated.
SystemChassis
Typegeneric / SAE
GroupC0
Range / number5 / AC
Possible causes
- Valve stuck closed high
- Carbon or debris buildup preventing free movement low
- Component wear with age - mechanical play 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: 2–6 h
- Component: brake blending valve
- MIL / check engine light
- drive cycle required
- limp mode possible
Sources
References
sae:J2012