10mm or 3/8
Use a flared end wrench
To remove the caliper bolts on a Nissan Titan, first, ensure the vehicle is securely lifted and supported. Use a socket wrench with the appropriate size socket (usually 12mm or 14mm) to loosen and remove the caliper bolts, turning them counterclockwise. It's advisable to apply penetrating oil if the bolts are rusted or difficult to remove. Once the bolts are removed, carefully slide the caliper off the brake rotor.
with a wrench
It will be a 14 or 17 mm wrench.
You need a 15 mm regular wrench.
Metric Allen wrench.
Lug Wrench to remove tire & Wheel Socket Wrench or Hex Wrench to remove Caliper bolts Large "C" clamp to collapse caliper piston Rags, and a good spray brake cleaner
You need a 3/8" Allen wrench to remove them.
9mm Allen wrench
use an Allen wrench not a socket or open or box wrench.
the caliper bracket bolts use 18 mm wrench on a 03 1/2 ton 4x4
The front caliper on a 1995 Ram is requires a 3/8 inch Allen wrench to remove the bolts.