AIR BRAKES - GENERAL INFORMATION6x4 Truck (Figure 9)Primary service system is at the front axle and forwardrear axle service brakes, secondary service system is atthe rear rear axle service brakes. Like the 4x2 truck, aninversion valve is used to apply the park brake at the rearaxle along with the secondary service brakes if air lossoccurs in the primary system.Figure 9 - 6x4 Truck With Refined Split Air SystemCTS-4154Y - Page 9
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