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ASVAB · Brakes and Suspension

What is the purpose of the brake master cylinder?

Reviewed by Jordan Morley, Editorial Lead at 247SimpleTests. Written by the 247SimpleTests Editorial Team from the official source material cited on every question.

Correct answer

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

  1. A Converts mechanical force from the brake pedal into hydraulic pressure that is transmitted to the wheel cylinders or brake calipers
  2. B Generates the heat that slows the vehicle
  3. C Stores brake fluid permanently
  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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About this topic: Brakes and Suspension

Brakes and suspension questions cover disc versus drum brakes, the hydraulic principle behind the pedal, ABS, and the shocks, struts and springs that keep the tyres on the road. Expect questions on symptoms such as pulling, pulsing or bouncing. This is one of 10 Auto Information questions on brakes and suspension, each with a full explanation on a single study page.

New to this exam? Our ASVAB exam guide explains the format, scoring, and how to prepare.

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