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3/8" Allen wrench.
It's 12 mm bolts, not Allen key.
on a 2002 it is a 3/8 th Allen wrench Actually the proper ones are a 7mm and 10 mm for the bracket bolts
In that period most Cadillac calipers were held by 15mm bolts.
That is a 3/8 Allen.
Most VW/Audit calipers are held by Torx bolts, not hex.
I thought my system had star bolts, not Allen bolts. You may need star wrenchs. I think mine were 10mm stars
7mm Allen wrench
Almost all Kia calipers are held with 14 or 17mm bolts, NOT Allen screws.
That is a 3/8 Allen.
Cavaliers from '94 to '03 all take 3/8 Allen key on calipers.
You need 3/8 Allen key.