Question 5
In a vehicle's braking system, the force applied to the pedal acts directly on the piston of which part?
The right answer is the one marked above.
The master cylinder. Its piston produces a pressure in the oil, and the oil transmits that pressure to the slave cylinder beside the wheel.
The slave cylinder is at the far end of the system — what reaches it is the transmitted pressure, not the pedal force. The pads and the disc come into play after that.