I used a 7mm hex bit socket. Worked fine, but the tool was a little hard to find. the 7mm hex key does not typically come in a L-key set.
7mm hex socket
7mm
You need a 15 mm regular wrench.
Metric Allen wrench.
It will be a 14 or 17 mm wrench.
45t
use an Allen wrench not a socket or open or box wrench.
14 mm
3/8"
You need a 3/8 Allen Wrench
Depending on which model caliper it will be 7mm or 3/8 Allen.
the caliper bracket bolts use 18 mm wrench on a 03 1/2 ton 4x4