What system pushes brake discs in a Cessna 172?

The hydraulic system is responsible for pushing the brake discs in a Cessna 172. When the pilot applies pressure to the brake pedals, this pressure is transmitted through the hydraulic fluid in the brake lines. Hydraulic brakes operate by utilizing the incompressibility of the fluid to multiply the force applied by the pilot, which results in the brake calipers squeezing the brake discs. This action is essential for effective stopping power during landing or taxiing.

Other systems, such as the electrical, fuel, and oil systems, serve different purposes and do not directly influence the braking mechanism. The electrical system may power lights and instruments but does not engage with the brakes. The fuel system supplies fuel to the engine, while the oil system lubricates the engine components. Therefore, the hydraulic system is uniquely designed to manage the braking function in the aircraft.