Is this possible? I was browsing thru one of the forum's sponsors and saw a control unit for sale. Can I just add the control unit, or would I also have to get new calipers?

 

You would need a lot of other pieces.
It is really not a practical swap
unless.....
you had a complete ABS donor car to work from.
And, what a job it would be.

 

You would need :

ABS sensors for all wheels (also wheel hubs with the rings on them)
ABS brain box
ABS master cylender
ABS wiring harness
ABS hydraulic box
all the brake lines

So, you put all this crap into your car, at 50 lbs in the process, and then 6 months later your ABS hydro box will be leaking out fluid faster than you can pee!

Don't waste your time

Gene
90 T2 with mods
currently at the mechanic getting leaky ABS box replaced with an empty spot under the hood in the shape of an ABS box