Properly adjusted handbrake and disc systems yet wheels near their bolts reach 50 deg C after only 12 miles. Vehicle owned from new ( Dec 2007 ) and 20,000 miles covered. When rear jacked up and handbrake "off" , wheels rotate reasonably freely apart from slight initial "stickiness". There is no perceptible hub end-float present. Is it worth trying to adjust stub axle nut to give some end-float ? ( should be 0.025 - 0.10 mm according to Fiat )