Definition
The friction-material components inside an aircraft disc brake assembly that press against a rotating disc when the brakes are applied, converting the wheel's rotational energy into heat and slowing the aircraft.
Plain English
The replaceable pieces that squeeze a spinning metal disc to slow the wheel down when you press the brakes.
Context Anchor
Seen during landing gear and brake discussions, preflight inspection, taxi operations, and landing rollout.
Derivation
From 'brake' (a device to slow or stop motion) and 'pad' (a soft or cushioning piece). The pad is the wearing surface that takes the friction so the disc itself does not.
Why Pilots Care
Worn or contaminated brake pads reduce stopping power, increase landing-roll distance, and can lead to loss of directional control on the runway.
Intuition Check
Brake pads are not the whole brake system. They are the replaceable contact pieces that press against the brake disc to create stopping force.
Example Sentence 1
During the preflight walk-around, the pilot checked the brake pads for excessive wear.
Example Sentence 2
After a short-field landing the instructor reminded the student to avoid riding the brakes so the pads would last longer.