I looked through my manual, repair and maintenence CD, and did a search on the site, no luck for my answer(s). The brake fluid calls for DOT 4. I picked up a bottle of ABS type fluid "exceeds DOT 3 & 4", and it is a synthetic. Is this OK to use?(topping off my reservoirs). Next, the rear reservoir under coolant (K12GT) overflow jug, the filler caps, do they have threads or simply pry them up gently because they have a rubber O-ring? and "snap" into place ?. One more, should the coolant overflow jug be more than half full?. I know on some cages the overflow jug has a max and minimal reading level. Of course I am using a high grade coolant 50/50 mix with distilled water. Thanks.