I am not sure about a 200 Expedition, but on a 2008 the Anchor bolts (bolts that hold caliper bracket to knuckle) are 24mm. Most vehicles, especially large ones, are either 21mm or 24mm anchor bracket bolts. The guide pin bolts (bolts that connect the caliper housing, with the piston, to the anchor bracket) are a 9mm Allen bolt.
If you don't have a 9mm Allen (many sets don't carry a 9mm), then the alternative way (and in my opinion easier) is to turn the outer pad clips slightly to allow you to pulls the entire caliper bracket off of the housing. This can only be done, of course, after you pull the entire caliper off of the vehicle. The new set will be installed the same way. You'll most likely need a screwdriver to lightly lift the clips and turn them so that they are pointing in the empty space in between the Housing and Bracket.
This is all for a 2008 model year, of course, but may still apply. Hope this helps!
A 3/8" Allen wrench will remove that bolt on the front caliper.
It takes a 3/8" allen wrench to r & r that caliper bolt.
Try 14 or 17 mm wrench. Most common on Jap cars that period.
You need a 15 mm wrench.
18mm
A 10mm wrench is used on most Freestars, but a few have 12mm.
9mm hex
14 mm
Type and year of car would help.
7 mm Allen wrench
.The 2000 Chevrolet Monte Carlo brake caliper bolt size is 9/16. The brake caliper bolt can be purchased at most auto-parts stores
stubby 18mm wrench and a hammer