You need a 15 mm regular wrench.
It will be a 14 or 17 mm wrench.
Metric Allen wrench.
If I'm not mistaken, 14mm for the caliper bolts, 17mm for the caliper brackets.
You need a 3/8 Allen Wrench
the caliper bracket bolts use 18 mm wrench on a 03 1/2 ton 4x4
it takes a 7mm Allen wrench to remove calipers on 2003 ford focus.
That would be a 7mm Allen.
It should be a 3/8" Allen wrench.