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the caliper bracket bolts use 18 mm wrench on a 03 1/2 ton 4x4
Metric Allen wrench.
It will be a 14 or 17 mm wrench.
the caliper bolts require a 3/8" Allen wrench. You can buy these as a socket at just about any parts store.
use an Allen wrench not a socket or open or box wrench.
A wrench is a lever for tightening or loosening bolts .
It should be a 3/8" Allen wrench.
7mm hex socket
Most likely a 3/8 Allen, but 15 mm wrench is possible.
Try 3/8 Allen key , or 15 mm wrench.
t-60
Loosen and remove the caliper retaining bolts. Torx T-40 or T-45