your going to need a t-40 torx socket.
You need a 15 mm regular wrench.
use an Allen wrench not a socket or open or box wrench.
Proper Torx bit or wrench for caliper C-Clamp to retract piston to get it off the disc
Lug Wrench to remove tire & Wheel Socket Wrench or Hex Wrench to remove Caliper bolts Large "C" clamp to collapse caliper piston Rags, and a good spray brake cleaner
Probably something close to a 21 millimeter
2006 lincoln navigator requires a 7mm hex to remove brake caliper
Remove wheel, remove the bolt holding brake hose to the caliper, remove the two pins that hold the caliper to the caliper bracket using a 3/8" allen wrench, remove caliper. Inspect brake pads and brake hose for damage, replace if necessary. Install new brake caliper in reverse order. Bleed system.
18mm
A 3/8" Allen wrench will remove that bolt on the front caliper.
7mm
3/8"
1. Remove the brake hose to caliper bolt from the brake caliper. 2. Remove the brake hose from the brake caliper. 3. Remove and discard the 2 copper brake hose gaskets. These gaskets may be stuck to the brake caliper and/or the brake hose end. 4. Cap or plug the opening in the brake caliper and the brake hose to prevent fluid loss and contamination. 5. Remove the 2 brake caliper pin bolts. Remove the park brake cable from the caliper. 6. Remove the brake caliper from the brake caliper bracket.