What is a common cause of brake pedal vibration or shudder when braking?

Brake pedal vibration or shudder when braking is typically caused by uneven rotor wear. This condition occurs when the brake rotors, which are critical to the braking system, wear unevenly due to factors such as excessive heat, uneven pressure from the brake pads, or improper installation. When the brake rotor surfaces are not smooth, they can cause the brake pads to grab and release inconsistently as they move across the rotor, leading to a vibration or shudder felt in the brake pedal.

The importance of understanding this is that maintaining even rotor wear is crucial for ensuring smooth braking performance and avoiding potential safety issues. Regular inspection and maintenance can help catch uneven wear early, preventing more severe problems that could lead to costly repairs or unsafe driving conditions. Factors like brake fluid contamination or tire alignment issues contribute to braking performance, but they do not typically cause the specific sensation of vibration in the brake pedal associated with uneven rotor wear.