Hello, this is emergency thing for me, i have 350z,
and i decided to change brake pads with out having any idea how to,
i removed calipers, and swapped old pads with new ones,
but i have no idea how to put the calipers back...
it seems like caliper brake pressure build in and i try to push it in,
but i cant.. what tool do i neeed and what does it called?
or what else i have to do?
its bit EMERGENCY! i need answers in less than 30 MIN! PLEASE HELP ME!

 

try opening the cap to the brake fluid reservoir under the hood... Then just use a pad spreader, or a large C-clamp and your old pad to push the piston(s) back.

 

can use a c clamp if need be...just put the old pad in. and use the clamp to squeeze the piston back in...assuming this is non brembo



here's quick way
toss the old pads back in. put the caliper back on..no need to bolt it up...but it works either way.
use a large flat head screwdriver to compress the piston back in...DO NOT push directly on the piston...only on pads.

below is example of c clamp

 

thank you so much for the answers people! it really helped me! now im on my way to go to the warmart and get c clamp!

 

you shouldn't have to crank down very hard on it to get the piston pushed back in...so if you do have to exert much force this is a problem. sometimes it can help to remove the MC cap...but lay it back in place...just not latching (I've seen the fluid spray engine bays down when cap is left off.)

also make sure you don't overflow the brake MC reservoir when pushing the calipers back.

another good idea is to do one side at a time...prevents confusions/mistakes.

 

If you remove the cap from the fluid reservoir, wrap a towel around the reseviour.

Its always a good idea to work with a friend who can observe the fluid level while you are compressing the calliper piston.