AIR BRAKES - GENERAL INFORMATION
4x2 Tractor (Figure 10)
Primary service system is at the rear axle brakes.
Secondary service system is at the front axle brakes.
trailer service brakes will assist either the primary or the
secondary systems during trailer applications.
Figure 10 - 4x2 Tractor With Refined Split Air System and Modular Control Valve For Spring Brake
and Tractor Protection Controls
CTS-4154Y - Page 10