if the pedal is spongey try the bleed first
but check the flow of fluid out of each nipple could be leaking wheel cylinder if it has drum rears just pull drum off and pull back rubber if fluid comes out replace cylinders.
if the flow is slower out of l/h/f and r/h/r or r/h/f/ and l/h/r could be a faulty accumulatoer or master cylinder.