TRDChris you have an air bubble in your brake system, even 1 little bubble can cause some problems. You should start by filling your brake resivor up first then pump your brakes 3 times. Then start at the closet to the master cylinder brake caliper driver side front, then passenger side front, driver side rear then passenger side rear. Bleed as much fluid threw your lines as possible. try to open each valve on the caliper atleast 3 times with pumping inbetween opening and closing. I cant say if this happened but when you install the spindle the caliper was usually turned upside down which has cause an air bubble in your brake system.