If you press the brake hard but cannot lock the tires, it means that the braking force generated by the pedal is insufficient, which is very dangerous. If the braking force of a car is too low, although it will still lock up during sudden stepping, it will also lose its tracking control ability. The limit of braking occurs at the moment before the brake locks, and the driver must be able to maintain control of the brake pedal at this force. To increase the brake pedal force, you can start by increasing the brake power assist device and replacing it with a larger Air Tank. However, the increase is limited because excessive vacuum assist force can cause the brakes to lose their gradual progression, and the brakes will be stuck to the bottom with just one step. As a result, the driver cannot effectively and stably control the brakes. The most ideal approach is to modify the master cylinder and slave cylinder, and further utilize Pascal's principle to increase the brake pedal force. When modifying the cylinder and fixture, the size of the disc can be increased simultaneously. The braking force is the force distance exerted by the friction force generated by the brake pads on the wheel axle. Therefore, the larger the diameter of the disc, the greater the braking force generated.

The force exerted by the brake caliper piston on the brake pads is called the Pedal Force. The force exerted by the driver on the brake pedal is amplified by the lever of the pedal mechanism, and then amplified by the vacuum power boost using the principle of vacuum pressure difference to push the brake master cylinder. The hydraulic pressure emitted by the brake master cylinder utilizes the incompressible power transmission effect of the liquid, which is transmitted to each cylinder through the brake oil pipe. The pressure is amplified using the "Pascal principle" to push the piston of the cylinder to apply force to the brake pads. Pascal's Law refers to the principle that the pressure of a liquid at any position inside a closed container is the same.
Pressure is obtained by dividing the applied force by the area under force. When the pressure is equal, we can achieve the effect of power amplification by changing the ratio of the applied and applied force areas (P1=F1/A1=F2/A2=P2). When used in brake systems, the ratio of master cylinder to slave cylinder pressure is the ratio of master cylinder piston area to slave cylinder piston area.