In an air disc brake assembly, the outboard brake pad lining is forced against the rotor friction surface by _______ movement

In an air disc brake assembly, the outboard brake pad lining is forced against the rotor friction surface by _______ movement

• A. Slack Adjuster Movement
• B. Caliper Piston Movement
• C. Pad Shims Movement
• D. Rotor Orientation Movement

Answer: (A)

In an air disc brake, the pad makes contact with the rotor because the slack adjuster translates the actuator’s motion into pad movement. When air pressure pushes the brake chamber, the push rod engages the slack adjuster, which then moves the outboard pad lining toward the rotor friction surface. This movement is what forces the pad against the rotor to create braking friction. Pad shims simply space or align the pad, and rotor orientation doesn’t drive the pad toward the rotor. While caliper pistons can apply force in many designs, this setup emphasizes the slack adjuster’s role in moving the pad to the rotor.

In an air disc brake, the pad makes contact with the rotor because the slack adjuster translates the actuator’s motion into pad movement. When air pressure pushes the brake chamber, the push rod engages the slack adjuster, which then moves the outboard pad lining toward the rotor friction surface. This movement is what forces the pad against the rotor to create braking friction. Pad shims simply space or align the pad, and rotor orientation doesn’t drive the pad toward the rotor. While caliper pistons can apply force in many designs, this setup emphasizes the slack adjuster’s role in moving the pad to the rotor.