Never had a day's bother with the hydraulics on the proper Citroen brakes and if you do need to bleed them, nice easy one man job. By contrast, over the years, have had plenty of grief with old fashioned brakes -- weeping cylinders; some are real sods to bleed; subsequent failure of master cylinders after bleeding; duff servos, etc. etc. A real backward step by Citroen, in my opinion --- no doubt driven by the accountants. As a matter of interest, did you wind up doing the head gasket on your Xantia ? I had about three 2.1 XM and it gave out on all of them -- not a fun job. Mike.