Air Brake Manual


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Dual-circuit system with spring parking brakes

When spring brakes are added to a dual-circuit system, the same type of dash control valve discussed previously is used (Fig. 34). Blended air is used to supply the control valve. Blended air is taken from the primary and secondary circuits through a two-way check valve.

Dual-circuit system with spring parking brakes. Relay valve installed in spring-brake circuit to quickly apply and release spring brakes
Figure 34. Dual-circuit system with spring parking brakes. Relay valve installed in spring-brake circuit to quickly apply and release spring brakes

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Rev: 2018