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Page 1 1 (2 pages) For HVAIS Proprietors & Examiners RTA Inspectors Vehicle Regulation Engineering Signatories RTA Registry Service Managers Published 11 December 2007 Vehicle inspectors bulletin Test procedure for Mercedes-Benz air-over-hydraulic brake system Purpose To inform Heavy Vehicle Authorised Inspection Station (HVAIS) examiners of the procedure for testing the air-over-hydraulic brake system fitted to Mercedes-Benz based trucks and buses such as the Vario. Background The Rules for HVAIS require air brake systems (including air-over-hydraulic) fitted to heavy vehicles to be inspected as part of the safety check inspection. Appendix ‘O’ of the HVAIS rules and Vehicle inspectors bulletin (VIB) No. 14 Test procedures for air brake systems outline the procedures to be used for inspecting and testing air brake systems on heavy vehicles. Mercedes-Benz based trucks and buses fitted with an air-over-hydraulic brake system are designed with a dual circuit split system. In the event of a failure of one sub-system, braking is provided through the intact