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Hi all... New member here... My name is Matt.  I have owned my 2003 X type for 5 years now... For me I love it. Been a Jaguar fan since 4 years old.  Wife bought me my first Jag for Christmas... 

However.... Having the habitual new tyre refits before the MOT, it was pointed out that the rear pads had gotten quite low and could be an issue for the MOT.  Having just spent a few quid on tires all round I'd just replace the pads myself.. (Not a difficult task) So, armed with new pads, set too and got them changed out.  All went swimmingly, and drove the car for the next few days without any issues. 
Did i mention I hadn't even touched the front brakes? Not even so much as removed the wheel.  But then out of the blue the front nearside brake is seized on! I use 1/4 tank of fuel and almost over heating the car Just inching her gently home.  Once the wheel had cooled enough, I had her back on the jack and inspecting the issue.... so tight was the brake I couldn't even turn the wheel with a huge great steel pole.  Sigh.  
So I set too, contemplating as to what it could be, asked some advice, as I hadn't even touched the brakes at the front.... Most of the advice came back as a seized caliper.  Great.  None of the other brakes were an issue.  Yeah I could've got one of those repair kits with new pistons etc... No... I just forked out and replaced ALL new discs AND calipers all round.  
All swapped out and YAY!!! She drove like a dream again..... 

For ONE !Removed! DAY! 
Same caliper seized on again.  
Now remember they're brand new! 
Brakes have been professionally bled with a continuous bleed system. 
So now I am stuck as to what it could be or were would be a good place to start looking for the fault and cause.  Only the font nearside is sticking... But, seems to release over night. 
I am able to drive the car but after a time the brake starts to lock on again.  
I get good firm braking, and the peddle isn't squashy in any way.  Engine doesn't struggle when braking.  

So, hopefully some collective minds maybe able to shed some light on what the issue maybe.  Or how I go about diagnosing the issue. 

Thank you in advance.

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Hi Manniewinaename... No it's not the Wheel bearing... it's definitely the brake seizing on.  I find it unlikely too as all the wheel bearings were replaced about 9 months ago. I now its possible one could go in a short time if poorly fitted, but find it unlikely as I say. 

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Try changing the flexi hoses, sometimes they swell up on inside and do not release the pressure which keeps the caliper from releasing.

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Funny you should mention that ... Someone else has suggested the same thing. Apparently the lining inside can fail acting like an aortic valve, stopping the fluid from flowing back, once the car is then left over night pressure in the lines can slowly decrease easing pressure on the caliper.   I have 2 new ones on order so fingers crossed. 

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If the new hoses don't solve the issue, looking at the ABS unit will be my next port of call.... question though, would a sticking solenoid within the unit not throw up an error code or bring the ABS dash light on as a failure?  as I have neither engine management light or ABS light on. 

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