Finding a complete Carmelite Breviary in PDF format depends on whether you are looking for the modern Roman-Carmelite use (OCD), the ancient Carmelite Rite (O.Carm), or a more progressive alternative. Modern Discalced Carmelite (OCD) Resources

Where to Find Authentic "Carmelite Breviary PDF" Files

Given the scarcity of physical copies (original volumes can sell for $500–$2,000 on antiquarian sites), the digital search is aggressive. Here are legitimate sources (and important caveats):

but add a "Proper" (a supplement of prayers for Carmelite saints). Carmel Prays

The ancient "Rite of the Holy Sepulchre" is harder to find in a single, modern PDF. Little Office of the Blessed Virgin Mary (Carmelite Use) : You can find historical scans like the Officium Parvum B.V.M. according to the Carmelite use on the Internet Archive Historical Scans