Take it back to the shop and ask them to cut down the brake cable.
If brake feel like crap, ditto to the above and ask them to trim the housing properly as well as a new cable, as most new bicycle have too much friction on the rear especially due to packing and transporting the pre-build bicycle.
Take it back to the shop and ask them to cut down the brake cable.
If brake feel like crap, ditto to the above and ask them to trim the housing properly as well as a new cable, as most new bicycle have too much friction on the rear especially due to packing and transporting the pre-build bicycle.