So you have changed the rack, 2 hubs and wheel bearings, 2 caliper assemblies inc pistons, 3 sets of 2 rotors, pads
All for $400 ??
something doesn't add up, wheel bearings alone for both sides would be close to $400
add hubs at $101 each discount price you are over $600 without any brake parts or a steering rack or an Alignment.
Who is doing this work, do you have receipts for the work done and parts replaced or is this just what they have told you ?