I recently bought a new road bike (a very entry model - Giordano Acciao) which has alloy dual pivot brakes. The brakes seem to work poorly, even though they are quite tight. If I squeeze the brake and push the bike forward it might still move - when riding this feeling is even worse, the brake just won't fixate the wheel to non-motion. How is that possible on a new bike? Is there something I can do and that I am missing and I should do? Shouldn't the brake stop the wheel completely?