Which brand of brake pads do you have? I replaced the Mercedes brand with Raybestos, and they squeak and make a little grinding noise at low speeds. The Mercedes brakes had anti-rattle shim that I could not make fit on the Raybestos. The Raybestos have a shorter braking distances.

As far as pulling. you can tell which caliper is pulling by driving the car for some distance and feeling the temperature of the rims. The hottest rim is the caliper that has the problem. You can also drive the car down a quiet street with no cars on it. Then you let of the wheel and slam on the brakes. The car may suddenly go right or left! From here, you have to decide which caliper is sticking. In my experience, bad calipers usually drag, and the car will go the direction of the dragging caliper. Sometimes the caliper freezes in the bore and only one brake works. The car will go the direction of the working brake.

You can also jack up the car. Have someone spin the wheel, and you hit the brakes. If the wheel doesn't turn freely after hitting the brakes, the problem is in that wheel.