Check the brake pads and rotors to make sure there is no rusty brake rotors. Bad brake pads and rotors will cause a screeching sound when braking. Running your hand across the rotors once they have cooled down should provide indicators of warping and waviness. If the end of the rotors have a lip, that is a sign of a bad rotor. Nonetheless, Brakes and Rotors should last a long time, roughly 30k-70k miles relative to how hard the driver brakes while driving.
If your rotors are worn then changing a brake pad is not going to solve anything. A bad rotor will eat through a new rotor quickly. So, whether it is an upgrade or it is time for the periodic rotor and brake pad replacement, then this video will show you the brake pad and disc rotors removal and replacement and the difficulty of completion to do it from home step by step.
CAUTION: Foreign cars (like Audi’s) require a special tool to decompress the caliper pistons. Otherwise, decompressing the pistons with a wrench will blow out the calipers.
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