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Analysis of pressure transients in brake system is very important for calculating brake force development, especially for vehicles mounted on ABS (Antilock braking system). This paper introduces an analytical dynamic model of the air-over-hydraulic (AOH) brake system mounted on heavy-duty off-highway vehicle (HOV). The paper relies on physical arguments to develop the mathematic models for the brake system components. And then a generalized AOH brake system, based on the systems analysis level for the components, is formulated in detail. The foundation drum brake is presented with a novel modeling method for the interaction with the apply system. And the pipeline hysteresis and fluid fluctuation of the brake system are well researched. Experiments are preformed on a bench setup and a real vehicle of the AOH brake system and the experimental data is compared with the simulation results. Preliminary analysis shows that the simulation tracks the data closely.