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The pedal goes to the floor, but not without assistance
This is generally due to the master cylinder failure. You should have it checked and replaced if it is found to be defective, and have the brake fluid flushed at the same time.
Q&A > Jaguar > 2003 Jaguar X-Type
Q&A > Jaguar > 2004 Jaguar X-Type
Q&A > Jaguar > 2005 Jaguar X-Type