This British Standard, which is published under the authority of the Automobile Industry Standards Committee of the B.S.I., is based upon data-sheet SMMT 45: 1958 of the Society of Motor Manufacturers and Traders Ltd. It specifies the form and dimensions for a 'contact' type coupling for vacuum and pressure braking systems on trailers and semi-trailers. For the arrangement of hoses, pipes, fixing and self-sealing devices see B.S. AU... and B.S. AU.... This coupling may be used as an alternative to the 'quick-detachable' couplings complying with B.S. AU ... and B.S. AU ...§.
note:* B.S. AU ..., 'Braking connections for articulated vehicles. Direct single-line vacuum system' (in course of preparation).
B.S. AU ..., 'Braking connections for articulated vehicles. Two-line air pressure system' (in course of preparation).
B.S. AU ..., 'Quick detachable coupling for use with single-line vacuum braking systems (upright)' (in course of preparation).
§ B.S. AU ..., 'Quick detachable coupling for use with single-line vacuum braking systems (inverted)' (in course of preparation).