Brake Noise When Pushing Car Forward Options

[Miniwerks]

New to this forum, picked up a very nice Nepal Orange 1976 with under 50k original miles. When I push it backwards in the garage it rolls without resistance, however when pushing it forward I hear the calipers rubbing on the rotors and feel resistance. May need to just drive it more but need to get it registered first. PO did not drive it as it was in his collection with many other Porsches. Other than driving it more, any other possible causes? Seems odd it rolls fine backwards. Looking at service history, PO did have the rear brakes done at 47,421 miles in 2018 and only another 2500 miles since then. Replaced rear calipers, pads and rotors, flushed and bled entire system and adjusted caliper pistons and parking brake.

[fixer34]

ALL wheels or just rears?

If jusr rears, maybe adjusting screws on rear calipers are too tight?
If all, see above, plus...
Front caliper pistons binding?
Or as someone mentioned, rubber hoses swollen all the way around? Quick test for this, crack the bleeder screws and see if fluid squirts out (rag is handy here..) and then the drag goes away.
May also be maladjusted master cylinder pushrod, not letting the internal pistons back far enough.