The Air Coils ”Suzies” found at the rear of a tractor unit when coupling / uncoupling to a trailer which provide compressed air from the tractor unit to the brakes of the trailer

Additional single abrasive discs also sold separately here

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Rec&Play: Diagnostic Session Recording

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EBS 18.02.1427 FOUR CIRCUIT PROTECTION VALVE ( AE4427 ) Diagnostic Tools The Air Coils ”Suzies” foundThe multi circuit safety valve is responsible for the distribution of the compressed air into the brake circuits independent of each other. In the case of a failure, one or more circuits protect the functional circuits against drops in pressure. Weight 1. 05 kg Dimensions 121 x 94 x 93 mm Cross References VOLVO : 3124013, KNORR BREMSE : AE4427, II15587000