What is the MOST LIKELY cause of a pulsation felt through the pedal after a complete front brake service?

• A. Uneven brake pad wear
• B. Over-torqued lug nuts
• C. Worn brake rotors
• D. Air in the brake lines

Answer: (B)

The sensation of pulsation through the brake pedal is typically associated with issues related to the brake rotor's condition. When brake rotors are warped or worn unevenly, they can cause an irregular contact surface between the rotor and the brake pads. As the brakes are applied, this unevenness translates to a pulsating feeling in the pedal. This is particularly evident after the brake service, as any changes made to the brakes could exacerbate existing issues with worn rotors.

In the context of other options, uneven brake pad wear and air in the brake lines can cause brake performance issues but are less directly related to the specific symptom of pulsation felt in the pedal after servicing. Over-torqued lug nuts, while they can lead to other handling or brake issues, would not typically cause a pulsation issue directly related to the braking process itself. This makes worn brake rotors the most logical cause of the pulsation sensation following a brake service.