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There exist two different methods to investigate the injury mechanisms and the tolerance levels, either sled tests or real road traffic accidents. Sled tests conducted at the University of Heidelberg and real accident cases examined by the University of Hannover were compared. The impact conditions of the Heidelberg sled tests were frontal collisions, with an impact velocity (Δv) of 50 km/h and decelerations of 10 g's to 20 g's. Twenty-nine tests with 3-point-belt protected cadavers in the age range 19 to 65 years were included in the Heidelberg collective. The Hannover sample contained 24 frontal accident cases (30 occupants) with a 100% overlap of the car front with the same Δv and average car deceleration range similar as the sled tests, the passenger compartment was only minimal intruded. Three-point belt protected drivers and front passengers in the age range of 18 to 71 years were included in the sample.

The new generation of air disc brakes developed by PERROT is suitable for Heavy Goods Vehicles (HGVs) from classes 4 to 8. Their design, construction and function is described in this paper. In addition, it is explained in which way the brakes are tested and proven on the different test rigs and in the vehicle.