From the section on PSM version 5.7
Fault code 4460: "Pressure sensor actual value is elevated and displays an implausible value."
Possible causes of fault:
- Adjustment of stop light switch is not OK.
- Brake light switch is faulty.
- Short circuit to B+/ground or open circuit in control unit circuit.
- Booster pump faulty.
- Pressure sensor faulty (hydraulic unit).