The force required to overcome the friction torque of the wheel brake in the tangential direction at the tire periphery is called the brake force F1(N).
Its value is
F1=T1/r
The braking force F1 of the brake depends on the structure, type and size of the brake, the friction coefficient of the brake friction pair and the wheel radius r.
Under normal circumstances, its value is proportional to the brake pedal force F2, that is, a linear relationship with the hydraulic pressure or air pressure of the braking system.
For a brake with a certain structure and size, the braking force of the brake mainly depends on the brake pedal force and the surface condition of the friction pair, such as the size of the contact surface and whether there is oil on the surface.
Obviously, if the ground adhesion is large enough, that is, F3>F1 is satisfied, and F1=F0, which means that the brake braking force F1 generated by the brake is completely converted into the ground braking force F0.
If the ground attachment condition is poor, when F3<F1, there is F0=F3<F1, indicating that F1 is restricted by F3 and cannot be completely converted into F0.
