FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

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What is the most probable cause of excessive left brake dragging on an airplane with no recent brake service work?

  1. A worn brake lining

  2. Leaking hydraulic fluid

  3. Foreign particles stuck in the master cylinder compensating port

  4. A malfunctioning debooster

The correct answer is: Foreign particles stuck in the master cylinder compensating port

The most probable cause of excessive left brake dragging on an airplane with no recent brake service work is foreign particles stuck in the master cylinder compensating port. When foreign particles become lodged in the compensating port, it can disrupt the fluid flow, leading to the brake not releasing as it should. This can cause the brake to drag, resulting in excessive wear and heat generation. Option A - A worn brake lining could cause issues, but it would generally affect both brakes equally rather than just the left one. Option B - Leaking hydraulic fluid could also cause an issue, but it would typically result in a loss of braking power rather than excessive dragging. Option D - A malfunctioning debooster could cause imbalances in brake pressure but is less likely to cause excessive dragging on just one side.