Why did you replace the calipers?? Did you have spongy brakes  before you
changed the calipers ?? You may have master cyl. problems or rear wheel cyl.
problems or leaks in your steel lines or rubber hoses . Remove the rear drums &
fold back the rubber boots on the wheel cylinders, both sides of the cyl. ,do
both  rear wheels.,if any seeeeeeeepage  replace !!! The life you save may be
your own.Tis also a good idea to get the rear drums cut or replaced with new
,then manually adjust the rear shoes tight then back off slightly ~ just enough
to feel a very slight drag when you turn the drum 1 complete turn   Rebleed ,if
all ck,s out ok.If you purchased your calipers from the chain store junk
stores. take em off & getum returned as faaaasssst as ya can !!!!!!!!!!  Then
purchase from a reputable source.Your area should have few good parts stores,if
not try the net. Have a good weekend guys !!                           Don at
DVW Import Auto Parts  1-800-248 -4802