there's a large empty spot in the upper-left-most section of the engine bay. If it's not empty, and a metal thing is there with a bunch of metal pipes coming out of it (the assembly is the ABS system) then you've got ABS, obviously.
The other way is to try locking up your brakes. Go pretty fast (maybe 40mph) and slam the brakes. If you hear a consistent squeel, you don't have ABS. If the squeal "chatters", you've GOT ABS.
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