That is a 3/8 Allen.
3/8 inch Allen wrench.
3/8"
It should be a 3/8" Allen wrench.
best answer is take it to a brake shop it's not something that should put your life on the line for. but if you have to do it you will need a Chevy brake tool or an Allen wrench to remove the calipers then its simple to switch out pads. drums again I recomend a shop.
Disc brakes
All Cavaliers from '94 to '03 used 3/8 Allen key on calipers.
I believe that needs a 3/8 Allen or some models, 7mm Allen.
do you mean cavalier hand brake?
All Cavaliers from '94 to '04 use a 3/8 Allen key on calipers.
No. But if you mean do they have ABS, no.
Drum
the caliper bolts require a 3/8" Allen wrench. You can buy these as a socket at just about any parts store.