Try a TORX T-40 or 45
Many second generation Expeditions (2003-2006) use a 9mm to remove the front caliper and a 7mm for the rear.
What size Allen socket is needed to remove bolt from caliper on 2004 ford escape
21mm socket and breaker bar to remove lug nuts, and a 17mm socket to remove the two caliper bracket bolts, and a 14mm socket or wrench to remove caliper from bracket. you will also need a c-clamp to shove caliper back.
You will need an 18mm socket and T45 torx (star) socket also. These will be used to remove the caliper from the rotor. The caliper has 2 parts that use a rail to align themselves and the brakepads.
I have a 2003 Escape and it took a 7 mm socket.
A 3/8" Allen socket or wrench will work.
7mm hex socket
your going to need a t-40 torx socket.
9mm hex
Caliper retaining bolts. Torx T-40 or T-45
use an Allen wrench not a socket or open or box wrench.
in order to remove the rear caliper, you first remove the parking brake cable using a 14mm socket to remove the bolt. After removing the parking brake you can remove the caliper carrier, using a 17mm socket to remove the two caliper carrier bols this allows you to remove the caliper from the rear rotor, you can slide the caliper off of the carrier to remove it completely. to remove the rotor you can use a soft faced mallet and gently tap the inside of it and it should come right off.
the caliper bolts require a 3/8" Allen wrench. You can buy these as a socket at just about any parts store.