My '94 Disco was making a funky noise while backing recently too.
I took off the rear driveshaft , put everything in neutral and spun the e-brake drum frontwards and backwards ... guess what? It only made the goofy binding noise spinning backwards.
You can either back off the adjuster until the noise goes away - at which point you have no parking brake, or replace the brake shoes, turn the drum/have it turned back to round, and clean up the adjuster bits.
My noise magically dissapeared and the park brake is actually back to a three click unit.