Brake problem, help!!!

[puckfotholes]

Just put new brake pads and rotors on my s13 and the front left pad was dragging on the rotor so I replaced it with a used s13 caliper that was known to be in good shape for an absolute fact! And now it's dragging again. Could my brake master cylinder be messed up or something? To mess up the good brake caliper again?

[bb4_96]

is your caliper slider rusted? are your brake lines any good?

[puckfotholes]

hmmm maybe the caliper slider, didn't know that could cause an issue! I kept the old slider on when i replaced it with the working caliper