you can go to any part store specialty tool section look for Chevy brake caliper tool less than 5 dollars
To remove the calipers from the mounts it takes a 3/8's hex...use a socket style one...an Allen key would take forever.
Cavaliers from '94 to '03 all take 3/8 Allen key on calipers.
3/8"
All Cavaliers from '94 to '04 use a 3/8 Allen key on calipers.
All Cavaliers from '94 to '03 used 3/8 Allen key on calipers.
3/8
You didn't say year, but most after '97 are 7mm Allen key.
A 3/8 Allen key.
That is a 3/8 Allen.
7mm Allen wrench
In that period most Cadillac calipers were held by 15mm bolts.
You need 3/8 Allen key.
All Cavaliers from about '94 to at least '04 use a 3/8 Allen key for calipers.