87 base. how do i find out if it has ABS
 

looking to replace the brake master, but when i look online for the part there is wo/abs and w/abs. so how do i tell?

There should be a light that comes on at start up for the abs and you will have the abs unit under the hood. It would be on the pass. side between the firewall and the strut tower. It will have several brake lines running in and out of it.