Fixing device for external attachment of cables or lines of housings

The invention relates to a fastening device (54) for external mounting of cables or lines of housings (12), in particular to housings of brake cylinders, comprising a fastening pin (56) which can be latched in a breathing bore (52) of the housing. The invention provides that in the fastening pin (56) a connecting channel (64) is formed, through which in the locked state, the interior (50) of the housing (12) is in communication with the atmosphere.