AIR BRAKES GENERAL INFORMATION

Figure 12 - 6x4 Tractor Refined Split Air System With Steel Spring Suspension and Separate Spring Brake and Tractor Protection Controls

DIFFERENTIAL POWER DIVIDER LOCK VALVE

TM-5-3820-256-24-4 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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AIR BRAKES –GENERAL INFORMATION AIR SYSTEM VALVES NOTE: Complete detailed Information pertaining to each of the air brake components may be found in the Air Brake Components section. INVERSION VALVE (FIGURE 15) An inversion valve is used in both initial and refined split air systems. On straight trucks and buses, this valve Is installed in the air brake system to apply the parking brakes on the rear axle along with the secondary service brakes if air loss occurs in the primary system. The split air brake system on most tractors functions in a similar manner as a straight truck except there is no need for an Inversion valve to apply the parking brakes. The trailer brakes which operate off the primary or secondary tractor air system provide braking effort to assist the tractor brake in an emergency situation if there is an air loss on one of the systems. Figure 15 - Inversion Valve All 6x4 tractors with the refined air system and air suspension (as shown in Figures 13 and 14) will be equipped with an inversion valve. The inversion valve is required on these vehicles should a loss of air occur in the primary system when operating during bobtail operation. On a straight truck which is equipped with trailer towing provisions, the vehicle will have a split air system which combines both straight truck and tractor air systems as previously described. WARNING: A LOW AIR PRESSURE WARNING BUZZER WILL SOUND IN THE EVENT OF A FAILURE IN EITHER THE PRIMARY OR SECONDARY SYSTEM. UNDER NO CIRCUMSTANCES SHOULD THE VEHICLE CONTINUE TO BE OPERATED WHEN A FAILURE IS INDICATED SINCE AIR PRESSURE CANNOT BE BUILT UP IN THE SYSTEM UNTIL THE AIR LEAK IS CORRECTED, EVEN THOUGH AIR FOR EMERGENCY STOPPING IS RETAINED IN THAT PORTION OF THE SPLIT AIR SYSTEM NOT HAVING A FAILURE. MODULAR CONTROL VALVE (FIGURE 16) A one piece push-pull (modular control valve) includes both parking brake and trailer air supply controls. This valve also is equipped with a shuttle type double check valve which replaces a double check valve in the plumbing system. A modular control valve can be utilized in initial or refined systems. Figure 16 - Modular Control Valve MANIFOLDED TRACTOR PROTECTION VALVE (FIGURE 17) A manifolds tractor protection valve includes two double check valve assemblies along with the stoplight switch port. This valve may be utilized in initial or refined systems. Vehicles with these valves also have the feature of Tractor Park Only and Trailer Charge with Tractor Spring Brakes Applied (tractor park only). Figures 10, 11 and 12 illustrated the use of a modular control valve and manifolds tractor protection valve in refined split air systems. Figures 18, 19 and 20 illustrate the use of a modular control valve and manifolds tractor protection valve in initial split air systems. CTS-4514Y-Page 15

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