What causes a car to tremble when pressing the brake?

A car may tremble when pressing the brake due to several factors, primarily related to the braking system. Common causes include warped brake rotors, which can create uneven contact with the brake pads, or worn brake pads that may not grip evenly. Additionally, issues with the suspension or alignment can contribute to vibrations during braking. It's important to have the braking system and related components inspected to ensure safe operation.