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Difficulty: EasyBraking Systems

Automotive braking systems rely on specialized mechanical and hydraulic parts to control and stop a vehicle. Which component correctly corresponds to each operational function listed below?

  • Master cylinderConverts foot pressure on the pedal into hydraulic fluid pressure
  • Brake boosterUses engine vacuum to reduce the physical effort required to apply the brakes
  • Wheel cylinderExpands internally to push friction linings outward against a rotating drum
  • Proportioning valveBalances hydraulic fluid pressure to the rear wheels to prevent rear lockup during heavy braking

Answer

Master cylinder matches converting foot pressure into hydraulic fluid pressure; Brake booster matches using engine vacuum to reduce physical pedal effort; Wheel cylinder matches expanding internally against a rotating drum; Proportioning valve matches balancing hydraulic fluid pressure to the rear wheels to prevent lockup.
Each component serves a distinct role in automotive braking: the master cylinder generates system hydraulic pressure, the brake booster provides vacuum power assist, the wheel cylinder actuates drum linings hydraulically, and the proportioning valve meters rear fluid pressure to prevent wheel lockup.

Step-by-Step Solution

1
Identify the primary function of the master cylinder.
It converts mechanical foot force into hydraulic system pressure.
Depressing the brake pedal pushes pistons inside the master cylinder bore to pressurize fluid in the hydraulic lines.
2
Identify the primary function of the vacuum brake booster.
It reduces the driver's physical effort required to apply the brakes.
A diaphragm operated by engine vacuum assists pedal travel before hydraulic pressure generation.
3
Identify the primary function of the wheel cylinder in drum systems.
It forces friction material outward against the rotating drum.
Hydraulic pressure pushes opposing internal pistons outward inside the drum brake assembly.
4
Identify the primary function of the proportioning valve.
It balances hydraulic pressure delivered to the rear brakes.
Restricting rear brake pressure under heavy stopping prevents rear-wheel lockup and loss of directional control.

Key Concept

Operational roles and hydraulic functions of core automotive brake components
Estimated Time:45s
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Topics

Braking Systems

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