I understand you are looking for a high-quality PDF of the (Volumes 1–3, usually). Before sharing links, it's important to know that officially sharing copyrighted Suzuki method books for free is illegal. However, here is the best practical advice to get exactly what you need, legally and in high quality.

If you are looking for general trumpet pedagogy materials available in various formats, these established methods are often used alongside or as alternatives to Suzuki: Suzuki Trumpet School, Volume 1: International Edition

. While many students search for "high quality PDFs," the official and most effective way to access these materials is through authorized physical or digital versions that include the essential audio recordings. Amazon.com 1. Essential Materials for the Suzuki Trumpet Method