Hydraulic brake assist requires replacement of which components as needed?

• A. Hoses and control valves
• B. Wheel bearings
• C. Piston rings
• D. Crankshaft position sensor

Answer: (A)

Hydraulic brake assist depends on a sealed hydraulic circuit that uses fluid pressure to multiply braking force. The parts that actually carry and modulate that pressure are the hoses and the control valves. Hoses can deteriorate, crack, or leak, which wastes fluid and reduces pressure, while control valves can stick or fail to regulate flow properly. When these components wear or fail, braking performance and the assist response become unreliable, so they should be replaced as needed to maintain a safe, responsive brake system. The other components listed—wheel bearings, piston rings, and the crankshaft position sensor—belong to different systems and do not directly affect hydraulic brake assist.