Spongy or just not stopping the rotor? Or both?
Spongy - bleed (would recommend bleeding front and back on a second hand bike anyway).
No friction - contaminated pad or disc. So could be that the disc is scoured and needs a rub with emery / wet n dry.
They do feel a bit spongy actually so bleeding them sounds like the best course of action.
I’m no expert, btw, this has just been my experience.
@motman started
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Spongy or just not stopping the rotor? Or both?
Spongy - bleed (would recommend bleeding front and back on a second hand bike anyway).
No friction - contaminated pad or disc. So could be that the disc is scoured and needs a rub with emery / wet n dry.