In a hydraulic disc brake system, the brake pads are pressed against the rotor by the ______

• A. Master Cylinder
• B. Bleeder Screws
• C. Caliper Pistons
• D. Piston Seals

Answer: (C)

In a hydraulic disc brake system, brake pads are pressed against the rotor by the caliper pistons. When you press the brake pedal, hydraulic fluid pressure builds in the system and is transferred to the caliper. The caliper houses pistons that move outward in response to this pressure, pushing the brake pads against the rotor to create friction and slow the wheel. The master cylinder provides the source of pressure, and the piston seals keep the fluid contained and allow the pistons to retract when you release the brake. Bleeder screws are for removing air from the system, not for pressing the pads.