Brakes are constantly in action and have many moving parts. Brake pads, shoes, rotors, brake calipers, master cylinders, and fluid all contribute to a functioning brake system. They are all susceptible to wear or damage in one form or another. Brake pad replacement due to wear is one of the most common, with an interval range from 25,000 to 50,000 miles, depending on your vehicle.
If you neglect brake pad replacement, your rotors will experience damage due to the metal-on-metal friction generated by the worn-down brake pad. Braking systems can also experience a leak, and determining the source isn’t always clear-cut. For example, the source of the leak may be from the master cylinder (internal or external), the bleeder bolts/valves not being tightened enough, or the caliper seal failing due to worn brake pads or shoes.