American cars never used Bristol keys. The Suburban most likely uses a 3/8 Allen key on calipers.
its not a hex,,,it`s a torx t30 i believe
It takes a T55 Torx bit on the front calipers.
7mm Allen wrench
whatever one fits, some are torx..
3/8 in drive torx wrench.
it takes a 7mm Allen wrench to remove calipers on 2003 ford focus.
18 mm I think.
7mm
3/8" Allen wrench
The T60 is the size needed to remove caliper bracket.
That is a 3/8 Allen.
3/8"