What is the primary purpose of a post-overhaul functional test for the brake system?

• A. To verify visual condition of components.
• B. To verify braking action only without anti-skid.
• C. To verify anti-skid, wheel-speed signals, and brake function.
• D. To calibrate navigation instruments.

Answer: (C)

After a brake overhaul, you must prove the system works as an integrated unit: the brakes apply with the expected force and feel, the anti-skid system engages correctly to prevent wheel lock, and the wheel-speed sensors provide accurate, timely signals to the anti-skid controller. This functional test checks not just the mechanical action but the whole control loop—hydraulic pressure and pedal feel, brake application timing, sensor data, and the anti-skid system’s response. If any part or signal is off, safe braking can be compromised even though the brakes seem to function visually or in isolation. A visual check alone won’t reveal leaks or degraded components, testing braking action alone omits anti-skid behavior, and calibrating navigation instruments has no bearing on brake performance.