Constant brake noise is never a good sound and any grinding noise spells real trouble!
Most importantly: As soon as any problem is noticed, get it repaired immediately. Delaying brake repairs is extremely dangerous.
Overstressed rotors and drums can break. Brakes may be too worn or damaged to stop your Audi in an emergency.
Even if you manage to avoid physical harm, the longer you delay fixing brake problems, the more you increase the cost of doing so.
Badly worn, warped or overheated rotors can damage wheel bearings and the complete wheel hub assembly. These parts often cost as much or more than the brakes themselves.
Even if you like doing your own work, every few years your Audi brakes should be examined by an Audi professional. Checking brakes for "run-out", warping, wheel bearing play, proper proportioning balance, among others, are normally more involved than can be accomplished in your garage. This inspection can also uncover underlying problems that could eventually become costly or dangerous.
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Audi Brake Rotors (discs) should be inspected all the way around the surface and on both sides for any concentric scoring (grooves) or obvious defects. If defects are found, replace your rotors immediately. Any rotor discoloration may be a sign of overheating and an inspection by an Audi brake repair professional is needed.
Audi Brake Pads will normally match rotor scoring but should also be inspected for uneven wear, breakage or cracking on the friction surface. Again, if defects are found, replace the pads immediately. Many cars also have brake pad sensors to warn of pad wear. If your Audi uses sensors, replace these at the same time as your pads.
Audi Brake Drums (if equipped) should also be inspected on a regular basis. Check for the same types of flaws as noted above. The drums should not have excessive grooves or have a deep "trough" dug into them where the shoes ride.
Audi Brake Shoes (if equipped) should be worn evenly and have no rivets protruding to the friction surface.
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