Need a little help here. gotta replace a sticking caliper and a rotor (we're way past turning). I need to know if I have 2W or 4W ABS. I thought all ABS was 4W but apparently I was wrong. Guy on the phone at Autozone said something about a plug on the front of the master cylinder, but I don't remember specifically. Any info greatly appreciated. BTW I'll bet 20$ against a stale breadstick it's the same darned rotor whether or not I've got 2W or 4W ABS. You know---I need a rear lugnut for a '98 F150----OK, you got A/C?---Hugh?

 

Do you have front disc/rear drums? if you do you most likely have just RWABS. My 97 has rear drums and only the rear has ABS..go figure??