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My servo needed replacing. With the diesel, it might be a servo or the vacuum pump causing problems. Presumably you're getting a hard brake pedal with no servo assistance? Servo / vacuum problems are common as far as I can tell, having Googled "S Type hard brake pedal", for example. If you look under the insulation flap by the bulkhead on the driver's side of the engine bay with a torch you can easily read the servo part number. It might be:- 6R83-2B195-BC, assuming that your VIN is very close to mine. There are several types and they are not, sadly, interchangeable, but if you check the part number you will find second hand replacements readily available from specialist breakers like Essex Jag. A new replacement from Jaguar costs £500 give or take a few pence. Hope this helps :)