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Function, Wheel Brake

When braking, the driver presses the brake pedal and an increased hydraulic fluid pressure is generated in the brake system. The increased pressure presses the piston and the inner brake pad against the brake disc at the same time as the brake caliper and the outer brake pad are pressed against the brake disc.
The dust boot (5) prevents dirt getting in between the cylinder and piston
The splash guard prevents water and salt from soiling the brake disc. Any soiling results in reduced friction and hence impaired braking power.
The electric parking brake is secured to the rear wheel brake. The electric motor is on the calliper and affects the piston mechanically, which then presses the pads together.