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Question

Difficulty: EasyBraking Systems

In an automotive drum brake assembly, which hydraulic component receives fluid pressure from the brake lines to push the brake shoes outward against the drum?

  1. A
    Brake caliper
  2. Wheel cylinderAnswer
  3. C
    Master cylinder
  4. D
    Proportioning valve

Answer

Wheel cylinder
In a drum brake setup, the wheel cylinder is mounted to the backing plate at each drum. When the driver presses the pedal, hydraulic fluid enters the wheel cylinder, forcing its internal pistons outward to press the brake shoes firmly against the inner surface of the brake drum.

Step-by-Step Solution

1
Identify the type of brake assembly described in the question.
The question specifies a drum brake assembly.
Drum brake systems use distinct components compared to disc brake systems.
2
Determine the wheel-end hydraulic component responsible for forcing the friction shoes against the rotating drum.
The wheel cylinder sits between the upper ends of the brake shoes and houses pistons that expand when hydraulic fluid enters.
When hydraulic pressure arrives from the master cylinder, the pistons inside the wheel cylinder push outward against the shoe links.

Key Concept

Drum brake hydraulic actuation
Estimated Time:45s
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Topics

Braking Systems

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