brake problems abs??

when i apply moderate pressure to the pedal antilock light comes on and brake light comes on. when you turn the switch on you can hear the pump running. when braking it seems as though the rear brakes arent working like they should. the pedal feels soft with the first pump but if you pump it once it seems to firm up a little bit. could this problem be the accumulator going bad and needing to be replaced? if so how can we get one?

Yep sounds like an accumulator, spinningwheelssc.com has accumulator balls

Definitely replace the accumulator.....

thanks for the help guys were ordering it tommorrow. im sure ill be gettin back to yall for some more help with things in the future