it seems that not many people go to the Suspension/wheels/tires/brakes section so I guess I'll have to seek help from here ALSO.

https://www.rx7club.com/suspension-wheels-tires-brakes-20/brake-changing-problems-573736/

here's the link to my thread in that section.

91 na Coupe with single piston front and solid rears
upgrading brakes from ^ to T2/GXL brakes

Basically, rear brake lines are a B**** to take off so I coulnd't replace with SS lines
Front threaded section of brake line is longer than the fitting in the 4pot calipers. Do I need T2/GXL lines or is that little gap safe to drive on and stuff?

 

has anyone JUST changed calipers from single piston to 4 piston????

 

I did, and answered the other post. The fitting doesn't need to be flush with the caliper, it seals into the bottom of the hole.