The pads are mounted in brake’s calipers that have an inspection hole on top that lets you check the thickness of the pads on both sides of the disc, also called the rotor.

In fact, you can check your brake pads without removing the wheels relatively easily on most cars. ... (about the same thickness as two U.S. pennies) or less, you need to replace your pads.

We’ve already covered how long brake pads should last, but here we’re going to go over a few quick ways you can check them yourself to determine whether or not it’s replacement time.

Brake rotors should be 8 to 30 mm thick, or whatever your vehicle manufacturer recommends. Measure them with a brake rotor gauge or micrometer measuring tool.

Brake pads only have a certain lifespan as the friction material on them gradually wears out from general usage. ... you can check the pad minimum thickness in your bike’s manual. ...

Brake pads do not last indefinitely, so it’s important to monitor for signs indicating that they need replacement. The frequency with which you should change your brake pads is about 30,000 ...