My truck needs new brakes on the front, and the rotors are acting like they are warped. So i am just going to replace them when I do the pads. How can I tell if I have 2 wheel ABS or 4 wheel ABS? My truck is in my sig, 2000 F250 2WD. Thanks guys!

 

You can have 3 lines going to your front wheels:

1. Brake line
2. ESOF line (not possible for you with a 2WD)
3. ABS wire

So, if you have 2 lines going up there, you have 4 wheel ABS. Only 1 line... you've got regular/non-ABS front brakes.

Rear ABS was standard.

 

What Brendan said to a tee but this also would be a great time to upgrade your rotors and pads for better stopping power, won't cost just a bit more but you'll have some premium stopping power. Slotted rotors and some Hawk pads are my next upgrade.

 

looked under my truck. I only saw one brake line to the caliper. But on the driver side, it was kind of hard to tell but I saw what looked like a line T'd into the brake line that went to the caliper. But i couldnt find anything like it on the passenger side, or on the rear. Is this the ABS line?

 

The ABS "line" is actually a wire to the ABS sensor. The sensor plugs into a hole in the inside, front portion of the spindle, and is retained by a small bolt (10mm if I remember correctly).
Look for the sensor and the wire.
The wire should be affixed to the front caliper's rubber brake line for a short distance with zip ties or similar, but then it will lead off to the front and inside of the spindle, while the brake line leads to the caliper.