[85_6mge]

Having never taken my ebrake apart I'm not exactly sure how the shoes work but maybe they are of the "leading shoe" design. That's where the front shoe has to make contact with the drum and in effect "pulls" the back shoe into contact with the drum. So perhaps when facing uphill the brake shoes take a bit more rolling resistence before there is contact on the drum from the back shoe.......or maybe there is uneven wear on the 2 shoes causing somewhat the same thing. HTH