whatever one fits, some are torx..
All Cavaliers from about '94 to at least '04 use a 3/8 Allen key for calipers.
9mm Allen wrench
3/8 in drive torx wrench.
from memory the correct size wrench is 9/16 inch box
use an Allen wrench not a socket or open or box wrench.
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.
Not to sure what your asking for but if you are trying to remove the front brake calipers so you can replace the brake pads you will need a 3/8" Allen wrench.
To remove a stripped bolt using an Allen wrench, you can try using a rubber band or a piece of steel wool to create more grip between the wrench and the bolt. Alternatively, you can use a hammer to tap the Allen wrench into the bolt to create a better grip. If these methods don't work, you may need to use a bolt extractor tool to remove the bolt.
To remove a stripped screw using an Allen wrench, you can try using a rubber band or a piece of steel wool between the screw head and the Allen wrench for better grip. Alternatively, you can use a screw extractor tool to grip and turn the screw out.
I needed a Hex 9MM worked great
It should be a 7 mm Allen.
All Cavaliers from '94 to '04 use a 3/8 Allen key on calipers.