In order to ensure the safety and rationality of the new generation wheeled mobile platform and to study the influence of the key brake elements in the braking system on the braking performance of the new generation wheeled mobile platform，a theoretical analysis model of the two-loop foot brake valve and the relay valve is established based on the new-generation hydraulic brake system developed by a model 8×8 full-electric drive off-road vehicle. Based on AMESim software，a simulation model of a new generation of full-hydraulic brake system of wheeled mobile platform is established. The influence of cover quantity，stiffness of upper spring and initial compression of reset spring on braking performance is analyzed，and the accuracy of the simulation model is verified by experiments. The analysis results show that the output braking force increases and the response time increases as the stiffness of the upper spring increases and the initial compression of the reset spring decreases； As the cover of the valve core of the foot brake valve decreases，the compression of the upper spring increases during balance and the output braking force increases； The output braking force is sensitive to the cover of the valve core and the stiffness of the upper spring，and the response time is sensitive to the stiffness of the upper spring. The theoretical model and the simulation model provide reliable basis for the performance adjustment and further optimization of the new generation wheeled mobile platform.