Your Mercury brakes are an amazing example of fine engineering, as well as a textbook example of fluid dynamics in action. Just consider the physics that are involved with the simple act of braking: you depress your brake pedal, and then your car transmits the force from your foot to its brakes through a fluid. That force is applied through leverage and hydraulic force multiplication. The Mercury brakes transmit the force to the tires using friction, and the tires transmit that force to the road using friction. Luckily, Mercury brakes usually give plenty of warnings before they fail. The brake pedal might be 'hard,' or resistant to pressure. You might hear squealing at low speeds that are emitted from your break wear sensors. You can check for brake pad wear by viewing the pads from outside the front tire. If the pad depth is less than ? inch, then replace the brake pad soon. If it's less than 1/8 inch, you are risking damage to the rotor and the replacement must be done immediately. Do not procrastinate on the task of brake maintenance, or you might face a catastrophic accident or engine destruction. Why purchase expensive parts and pay for labor at a dealership, when you can buy Mercury brake parts here and do the job yourself?