What could indicate that the master cylinder is failing?

• A. Soft brake pedal
• B. Squealing brakes
• C. Vibration in the steering wheel
• D. Increased stopping distance

Answer: (A)

A soft brake pedal is a key indicator that the master cylinder may be failing. When the master cylinder begins to wear out or if there is a leak in the brake system, it can lead to a loss of hydraulic pressure. This loss results in a brake pedal that feels spongy or soft when pressed, rather than providing a firm, responsive feel. A properly functioning master cylinder is crucial for maintaining adequate pressure in the brake lines, which is necessary for effectively engaging the brake pads.

Other symptoms, such as squealing brakes, typically point towards worn brake pads or issues with the brake shoes and are not directly tied to the master cylinder's functionality. Vibration in the steering wheel could be associated with issues related to the suspension or tires rather than the braking system itself. Increased stopping distance might indicate broader problems with the braking system or tires but does not specifically point to master cylinder failure. Therefore, the soft brake pedal is the strongest and most direct sign of an issue with the master cylinder.