Help! First sign of anything untoward was on visit to Longleat when pedal crept down to the floor! It pumped back up and worked ok. About a week later after 2 or 3 mile journey pedal got progressively stiffer and O/S/F brakes stuck on! Have cleaned plunger and fitted new pads, still after about 5 miles pedal stiffens and brake sticks on! If left for an hour pedal returns to normal travel and on we go for another 5 miles. Have ordered new flexi-hose but could it be; servo? master cylinder? caliper? or what?