If the rotors have clearly worn grooves in them, they will need to be replaced. Your rotors should be perfectly flat and smooth. Even if you have slotted or drilled rotors, the surface itself should be even all the way across. If you can't tell right away whether or not the rotors are perfectly flat, you can park with your wheels turned to the left or right and get them on a good angle for viewing the rotors. Any substantial wearing down means they're not working as effectively as they could be.
In extreme cases, your rotors may have actually cracked all the way through. Cracks are very noticeable, and also very dangerous to leave unrepaired. Your brake pads can't get a proper purchase on a cracked rotor.
Worse, the rough edges of that crack are going to shred your pads something fierce. The result of which will be incredibly uneven braking.
Aside from the sight and sound that the rotors will make when something is wrong, you'll also be able to feel it when you're driving. If you're getting some push back when your foot hits the brake, especially in the form of a wobbling or pulsating feeling, that's an indication that there is some issue with your rotor.
When they wear down it's generally uneven so as the calipers press the pads into the rotor, the result is an uneven braking. That pushes back and you can feel it. It's a pretty helpful tool for judging whether or not you need to take your car in to get looked at.
In more extreme cases, you'll be able to feel these vibrations not just through the brake pedal but even in the steering wheel. This is because your steering and brake systems are very closely related in the car. You definitely want to get to a mechanic as soon as you can if you find that the steering wheel is giving you some vibrations or wobbles anytime you apply the brakes.
Even if you haven't noticed the sound or felt anything unusual in the brake pedal, you may notice when your rotors are failing because of poor performance. If it gets so bad that you find yourself having to stop far in advance of where you actually want to stop, then you know things have gotten bad. When your brakes seem to be soft or spongy and even with your foot all the way down it takes a bit of coasting before you finally come to a complete stop, you absolutely need to get them checked out right away.
It's far too dangerous to drive anywhere under these conditions. Imagine what could happen if you needed to break in a hurry to avoid another car or pedestrian, but your brakes were in such bad condition that it requires 10 or 20 extra yards to get that done.
You can't take a risk like that. There's a chance that your car will give you a warning when there's a problem with your brake rotors. Check the dash for the ABS light. Keep in mind that rotors reach their wear limit at only about 1mm. If there is an obvious lip, it's most likely near it's wear limit or is wearing unevenly. Measure with calipers to double check. Heat Spots Heat spots Fig. How do they affect you? Heat spots will lead to brake harshness, vibration and reduced structural integrity.
Heat spots on brake rotors occur when brakes aren't broken in bedded properly and the brake pad deposits on the rotor accumulate and eventually turn into a compound known as cementite. You don't want Cementite on your brake rotors.
Cementite is compound that is very hard, overly abrasive and doesn't allow the rotors to cool properly. As a result, Cementite heats up the local area around itself growing in size and reducing the cooling capacity of your brake rotors. See our Brake Rotor Bedding Guide. If this is caught early on, you can possibly remedy it by bedding in your brakes with a more abrasive pad, or resurfacing your rotors.
If the heat spots are extensive, you will need to replace your rotors. Rust There are two types of rust that occur on brake rotors. Naturally, this heat can cause the rotors to become worn, warped, and uneven over time. The result? A vibrating steering wheel. If you ask us, intermittent screeching when you brake is worse than nails on a chalkboard.
This screeching happens when the braking system engages with rotors that have developed grooves over time. You might get the blues every now and then, but when we're talking about your brake rotors, we mean something totally different!
If your rotors display a blue coloration, excessive heat—not sadness—is the likely culprit. To check for blue rotors, squat down next to one of your wheels and look behind your wheel spokes. See a disc-like object? If things look blue, it's time for a brake inspection , at a minimum.
Especially now that so many cars come with automatic emergency braking. Many owners know to regularly inspect and change their brake pads. After all, the best pads in the world are useless without a rotor to grip. But are your brake rotors due for replacement? Reminder: let your brembo brakes shine like a jewel.
Do you feel a pulse when you step on the brake pedal, almost like the ABS is kicking in? It Still Runs explains that the pulse comes from the rotor unevenly striking the brake pads. This causes vibrations to spread through the brake fluid, which spreads into the brake pedal.
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