I have a 90gx and I just purchasd a used set of 4 piston calipers. Before I take off my wheels and put them in I'm wondering if its a straight caliper swap in and out or do I need to change a whole bunch of stuff?

 

Just the calipers, and make sure you have the "HARD LINES" for the 4 piston calipers. The hard lines is basically an and extension line (made out of aluminum) that goes in between the caliper and the brake line.

 

you'll need some new pads too (hopefully some came with the calipers)

john

 

i did the same thing, but before swapping them on i rebuilt them. when i swapped them i also put in stainless lines and hawk pads.

 

You will want to use new brake rotors as well, so that you can actually use the 4 piston brakes to the full advantage.

 

new rotors are coming in the spring hopefully.

 

Can you put 4 piston calipers on 87 n/a brackets? and will they fit under 14"?

 

They won't fit under the 14" phone dials, that's why all the S4's with the five lug brakes had 15" (Sport, GXL, GTU) or 16" (Turbo II) wheels.