Division 3.1.2 Trailer without a service braking system United Kingdom Original text. Later amendments are not shown. 3.1.2.1The permissible towable mass shall be the lowest of the following values: 3.1.2.2Division 3.1.2.2 ← Division 3.1.1.2 Division 3.1.2 Division 3.1.2.1 →