Brake boosting capability is lost in DPB system.
<0.01% (Extremely rare)
Power braking assist reduced
Braking may require increased effort
System will request Hydraulic Boost Compensation when driver pressed the brake pedal.
Brake boosting capability is lost in DPB system.
Plunger Separation Valve or Plunger Overshoot Valve inoperable (aka huge leakage rate present in plunger circuit) OR no brake fluid OR wrong plunger configuration (as held in EEPROM), Fault is raised if Active System Tests (component STS) detect a latent fault that might jeopardize the hydraulic backup functionality. The first occurence of the fault may only be detected right after the start of a new OtherCycle, when in full hydraulic system and at earliest if any brake event has been absent since the start of a new OtherCycle. The system reaction to the presence of the fault is DPB Hydraulic Backup (without brake boost).
No issue is detected in current operation cycle.
Model Y 2025+
customer, service-fix
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