1995 Mercury Villager

Brakes problem
1995 Mercury Villager 6 cyl Automatic 156000 miles

I just replaced the front and the rear brakes last week, including: brake shoe set, wheel cylinders, brake pads, brake rotor, etc. However after I drove the car for 5 min, I smelt something burning from the left front wheel. And the wheel is much hotter than the other three. They checked my car and said that the brakes dragging. There is a blockage in anti lock brake valve. So they asked to change ABS HYDRAULIC UNIT.

This problem never happened before I changed the brakes. I felt that it came from their inappropriate assembly. Of course they denied. May I ask how the problem coming from?
September 28, 2009.

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