Jaguar Repair Problems? Ask a Jaguar Repairs Expert.
Ok looks like the most likely cause is the brake booster. It has the internal solenoid as well as the force and travel sensors. If a new or used one is installed it will need to be calibrated ith the SDD. To recalibrate you will need to program the ABS/Trac system. It will also calibrate the steering angle sensor. I also recommend monitoring the wheel wpeed sensors on datalogger on the SDD just in case.
Let me know.
With SDD we can perform a configuration to recalibrate the booster. If it is not under your service function/setup and configuration then you may need to reprogram the ABS module.