t-60
Most likely a 15mm wrench. Unlikely to be Allen in that vehicle.
You need a 3/8" allan key or hex socket - not a torx
Metric Allen wrench.
You need a 15 mm regular wrench.
It will be a 14 or 17 mm wrench.
45t
To change the rear brake pads on a 2004 Pontiac GTO, you will need the following tools: a lug wrench to remove the wheel, a C-clamp or brake caliper tool to compress the caliper piston, a socket set or wrench to remove the caliper bolts, and possibly a torque wrench to ensure proper reassembly. Additionally, having a brake cleaner and a bungee cord or rope to hold the caliper up while working can be helpful. Always ensure you have safety equipment, such as gloves and goggles, for protection.
use an Allen wrench not a socket or open or box wrench.
14 mm
3/8"
You need a 3/8 Allen Wrench
the caliper bracket bolts use 18 mm wrench on a 03 1/2 ton 4x4