exactly what does this attach to?

Does this help?....



[attachment=35483:attachment]

if thats a j-spec motor, thats for the power brakes

Yep, brakes.

That's for the brake booster alright...

so do I cap it or what?

unless you have your brake booster pulling vaccum off something else, i'd run the line from the brake booster to it

do I have a brake booster, my car isnt J-spec, but the motor is

i do not know if all FC's had power brakes or not.



does the master cylinder bolt directly into the firewall, or is it mounted in a round, black cannister?

well apparently my brakes are boosted because I traced my plumbing and hooked it up. Now im trying to start it and its not going well lol