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Driver's side caliper is not working properly. Either it's bad or you need to bleed your brakes. Another possibility is a bad rotor on the D/S or a leaking caliper or brake line.
Does it only pull to the right only when you step on the brakes? If so that's because your passenger side front brakes are working and the driver's side are not. If it pulls to the right even while your driving then it's probably an alignmment issue like Durango_Boy said.
Mine did the exact same thing when I first test drove it. The left front caliper was frozen and not grabbing the rotor. Once it worked itself free, the pulling to the right stopped.
Also, look at the inside of the left side tires and see if you notice any brake fluid leaking down the tire.