In their workaday life, teachers are faced with multiple complex tasks. How they carry out these tasks is also influenced by their epistemic beliefs and the beliefs they assume their pupils hold. In an empirical study, pre-service teachers' epistemic beliefs and those they assume of their pupils were investigated in the setting of teacher education for vocational schools in Germany. Results of the empirical study point at significant inconsistencies between pre-service teachers' beliefs, the beliefs they assume of their pupils and beliefs conducive to the curricular and didactic concept preferred for vocational schools. Partly, these inconsistencies can be explained by pre-service teachers' learning experiences in school and university. It seems important that the education of teachers in vocational education aims at scaffolding pre-service teachers in developing beliefs that are conducive for their future profession.