On most 2006 Expeditions, the front calipers use a 9MM hex bit while the rear calipers use a 7MM hex bit. 9mm hex bits are not easy to find as singles and will usually only be found as part of large metric hex bit sets. .
To remove and replace floating caliper mounting bolts. 3/8" and 8mm hex bits are used for General Motors vehicles. 7mm and 1/4" hex bit are used for Ford. 2003-2006 Ford Expedition use the 7MM hex bit. 7MM hex bit does not work on a 2006 Expedition. Looks like it requires a 9MM, the only one that is not included in my hex set. On a 2006 Expedition Limited, the front calipers use a 9MM hex bit while the rear calipers use a 7MM hex bit.
9mm hex socket bit
Home depot. The Huskey 13 & 26 piece kits include a 9mm Hex Key.
9MM. Very hard to find. Snap-On tools has it. Maybe Sears. Some Auto-parts stores will carry 9MM as a part of a large set of Metric hex bits; you will rarely find anyone selling them as a single hex bit.
drivers side is a t45 hex other side is a 9mm If you're asking about the hex bolts attaching the calipers to the rotor, those are 9mm for the front brakes, and 7mm for the rear. 7mm is a standard size and can be found anywhere....9mm are usually sold only as part of large (expensive) metric hex bit sets or as special orders. Various auto parts stores will carry the metric sets, Snap-on tools will likely have the singles and sets.
9mm hex
The size is 9mm hex. It needs to be long enough to reach the recessed caliper bolt.
9mm hex key front and 7mm rear
Either 9mm hex or Torx T-45
swimming in beer
I needed a Hex 9MM worked great