It is always a good idea to clean the spindle, axleshaft and axle bearings with a solvent prior to reassembly. You do not want dirt contaminating any of these critical wear surfaces. Once clean, the new caliper-mounting brackets are installed on the axle flanges. ORD supplies spacers that need to be installed between the bracket and housing flange. The bracket should be orientated approximately 45 degrees up at the rear of the housing, as shown here.