AIR BRAKES - GENERAL INFORMATION6x4 Tractor With Steel Spring Suspension (Figures11 and 12)Figure 11 illustrates a tractor with a modular control valvefor spring brake and tractor protection controls, whileFigure 12 illustrates a tractor with separate spring brakeand tractor protection controls. Primary service systemis at the front axle and the rear rear axle brakes,secondary service system is at the forward rear axle.The trailer service brakes will assist either the primary orsecondary systems.Figure 11 - 6x4 Tractor Refined Split Air System With Steel Spring Suspension and Modular ControlValve For Spring Brake and Tractor Protection ControlCTS-4154Y - Page 11
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