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Brake system independent of aircraft hydraulics

Aviation Mechanic Airframe (AMA) practice question 3 of 17 on Landing Gear Systems. ACS element AM.II.E.K11 · difficulty: recall. Want to answer it in a timed quiz? Use the Aviation Mechanic Airframe (AMA) practice mode.

Question bank updated 2026-09-22

QUESTIONWhich brake actuating system is in no way connected to the aircraft main hydraulic system?

  1. AThe boosted brake actuating system
  2. BThe independent master cylinder system
  3. CThe power brake system with a debooster
Show the answer and explanation

Correct answer: B. The independent master cylinder system

  • A — incorrect A boosted system uses the aircraft hydraulic system intermittently, when extra pressure beyond foot pressure is needed.
  • B — correct An independent brake system is not connected in any way to the aircraft hydraulic system; master cylinders linked to the rudder pedals develop all of the pressure.
  • C — incorrect Power brake systems use the aircraft main hydraulic system as their source of pressure at all times.

BACKGROUND

The handbook lists three basic brake actuating systems: an independent system not part of the aircraft main hydraulic system, a booster system that uses the aircraft hydraulic system intermittently when needed, and a power brake system that uses the aircraft main hydraulic systems as its source of pressure. Small, light aircraft and aircraft with no hydraulic system use independent brakes, in which a master cylinder for each brake is mechanically connected to the corresponding rudder pedal. Pressing the top of a pedal drives a piston in a sealed fluid-filled chamber, sending fluid to the brake pistons, which push the linings against the rotor. Some master cylinders have built-in reservoirs while others share a single remote reservoir. In an independent system the braking pressure is only as great as the foot pressure applied, which is why heavier aircraft move to boosted or power brakes.

STUDY TIP

Sort the three systems by their relationship to ship's hydraulics: none, occasional, and always.

KEY POINTS

  • Independent brake systems use master cylinders and no aircraft hydraulic power.
  • Boosted systems tap the aircraft hydraulic system intermittently.
  • Power brake systems draw their pressure from the main hydraulic systems.

SOURCES

  • FAA-H-8083-31B ch13 "Brake Actuating Systems"
  • FAA-H-8083-31B ch13 "Independent Master Cylinders"
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MORE ON LANDING GEAR SYSTEMS

SkyDrill is not affiliated with the FAA. This is an original practice item based on FAA-H-8083-31B Aviation Maintenance Technician Handbook – Airframe, and 14 CFR part 43. Regulations and handbooks are revised; confirm details against the current edition.