Recently had new rear brake pads installed on my 2006 sportster (10 days ago) While riding down the interstate rear brake locked, stopped on shoulder of road and bike would not move in neutral, rear rotor was smoking fluid dripping from caliper, then brakeline hose exploded like a gunshot. WHY? Let rotor cool down then rode home sans rear brake. What was the problem? My shovelhead once did this in arkansas a week after I put DOT 4 fluid in front cylinder accidently.