Air suspension, and its contribution to improve driving comfort, is particularly well-established as a valuable feature in heavy trucks and trailers. WABCO has developed the compact Electronic Leveling Module (ELM) specifically for this market. ELM combines the functions of the conventional leveling and the rotary slide valve, offering considerable advantages compared to conventional air suspension systems. ELM works in combination with WABCO's Vario Compact ABS for trailers (VCSII) or the Electronically Controlled Braking System, Trailer EBS. The easy installation of ELM requires no additional diagnostic tools.