A method is provided for adjusting the play between the brake linings and the brake disc of a pneumatically actuated disc brake by way of at least one or several adjustment devices actuated by electric motors. The tool comprises a receiving portion in a distal end of the mounting tool for receiving the flexible part thereat and a handle portion proximally of said receiving portion. Furthermore, the two handles can be adjusted without the intervention of a person disassembling the drinking vessel in order to reorient or readjust the handles.