front brakes M-spring
 

hey people! im new here. just bought a protege that needs brakes all around. this m-spring that i see what is its purpose and how critical is it?
i misplaced 2 of them in the yard while changing out the pads and rotors. now i have a grinding on my new rotors and not looking to replace the whole caliper just for these bread ties.
also any pointer on this brake change would be awesome as i plan on doing the drums next!
respectfullu,
phil