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If you certain you bled the brakes properly and in the right sequence (rr, lr, rf, lf) yes its a safe bet you need a new master. You will want to make sure to bench bleed that first before installing it, it probably comes with instructions in the part box.
Occasionally bad rotors or rotors that have been refinished improperly can also cause a spongy pedal feel. So can a very old or damaged brake hose that has collapsed inside (although this is not common). But 9 times of 10 in cases like yours, its the master.
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