What component could lead to a spongy brake pedal feel if it is leaking?

• A. Brake rotors
• B. Master cylinder
• C. Brake pads
• D. Caliper

Answer: (B)

A spongy brake pedal feel is often a sign that there is air in the brake lines or a problem with the hydraulic components of the braking system. The master cylinder is responsible for generating hydraulic pressure when you press the brake pedal. If the master cylinder is leaking, it can allow brake fluid to escape, leading to a loss of pressure and a spongy feel in the pedal. When the brake fluid level drops or air enters the system due to this leak, the pedal may become soft or feel springy rather than feeling firm and responsive.

In contrast, brake rotors, brake pads, and calipers do not directly cause a spongy brake feel. Brake rotors and pads are primarily involved in the actual stopping power, while calipers serve to clamp the brake pads against the rotors. Although issues with these components can cause braking inefficiencies, they do not typically result in a spongy pedal unless they are causing a fluid leak in conjunction with the hydraulic system. Therefore, the master cylinder is the most critical component that could lead to a spongy brake pedal if it is compromised by a leak.