Brake systems — component contacted by the brake shoe lining during braking When a drum brake is applied, the shoe pivots outward so that its friction lining presses against which component?

Introduction / Context:
In drum brakes, hydraulic pressure moves wheel cylinders to force shoes outward. Understanding which component the lining contacts clarifies inspection, wear patterns, and noise diagnosis.

Given Data / Assumptions:

• System type: leading-trailing shoe or duo-servo drum brake.
• Brake actuation: wheel cylinder expands shoes.
• Question focuses on the contact surface during braking.

Concept / Approach:
The friction lining on each shoe is bonded or riveted onto the shoe web. When actuated, the lining arcs outward to contact the inner cylindrical surface of the rotating brake drum fixed to the wheel hub, converting kinetic energy to heat via friction.

Step-by-Step Solution:
Identify brake type: drum brake.Apply actuation: wheel cylinder pushes shoes outward.Determine contact: lining presses on the inner surface of the brake drum.

Verification / Alternative check:
Exploded diagrams show wheel cylinder at the top, anchor pin at the bottom; neither is the friction surface. The drum is the rotating element that the lining rubs against.

Why Other Options Are Wrong:

• Wheel piston or cylinder: actuating component, not the friction surface.
• Anchor pin: pivot/support, not a friction element.
• Wheel rim or axle: not involved in brake lining contact.

Common Pitfalls:
Confusing disc vs drum brakes; in disc brakes, pads contact a rotor, not a drum.

Final Answer:
brake drum