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ASVAB · General

What is the purpose of the brake master cylinder?

Correct answer

Converts mechanical force from the brake pedal into hydraulic pressure that is transmitted to the wheel cylinders or brake calipers

  1. A Stores brake fluid permanently
  2. B Converts mechanical force from the brake pedal into hydraulic pressure that is transmitted to the wheel cylinders or brake calipers
  3. C Generates the heat that slows the vehicle
  4. D Only applies the parking brake

Why this is the answer

The MASTER CYLINDER is the heart of the hydraulic brake system. When the driver presses the brake pedal, the pedal pushrod pushes a piston inside the master cylinder — this pressurises brake fluid, which transmits force through the brake lines to the wheel cylinders (drum brakes) or calipers (disc brakes) at each wheel. Modern vehicles have DUAL-CIRCUIT master cylinders — two separate hydraulic circuits so that if one circuit fails (line breaks), the other maintains braking on two wheels.
Source: ASVAB AI, Braking Systems — Master Cylinder

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