The sensible thing to do is get the wheel off and look. Try different wrenches on if you are not sure. Then at least you are not taking someone else's word for an important job.
3/8"
Cavaliers from '94 to '03 all take 3/8 Allen key on calipers.
No
18 mm I think.
3/8" Allen wrench
15 mm
it takes a 7mm Allen wrench to remove calipers on 2003 ford focus.
All Cavaliers from '94 to '04 use a 3/8 Allen key on calipers.
I believe that will be a 7mm Allen key.
All Cavaliers from '94 to '03 used 3/8 Allen key on calipers.
The T60 is the size needed to remove caliper bracket.
In that period most Cadillac calipers were held by 15mm bolts.