7mm
2006 lincoln navigator requires a 7mm hex to remove brake caliper
You need a 15 mm regular wrench.
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.
3/8"
use an Allen wrench not a socket or open or box wrench.
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.
Not likely to be Allen key, try 15 mm regular wrench
You need 15 and 18 mm wrench.
"Caliper anchor bolts" hold the brake caliper on, they require a 3/8" Allen wrench to remove.
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