AIR BRAKES - GENERAL INFORMATIONREFINED SPLIT AIR SYSTEMChanges in the FMVSS 121 regulations made it possibleto change the air system to what is called the "refined"split air system.The refined split air system can be identified by the quickrelease valve (Figure 2) in both primary and secondaryservice brake systems as well as the parking brakesystem. The primary system will not always be at therear axles.Figure 3 - 4x2 Truck With Initial Split Air SystemCTS-4154Y - Page 3
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