So how do you know you need new brake rotors? Everyone knows that you need to periodically replace your brake pads, but not many people give much consideration to the rotors. A brake rotor is the disc that the brake calipers and brake pads grip onto, causing the friction that slows you down. The symptoms of worn out rotors are very different from those of worn out brake pads. Here is a few signs that it’s time to get new brake rotors:
Signs its time for new brake rotors
- Grinding or screeching: While it’s true that these horrible noises are most often caused by worn out brake pads, they can also be a sign that your rotors need to be replaced. Unfortunately, it’s almost impossible to tell if the sound is being caused by the brake pad or the rotors. So, if you are hearing that awful squelching sound when you hit the brakes, you’ll likely need to get both your brake pads and rotors examined to find the source of the problem.
- Pulsing or uneven braking: If you hit the brake pedal and feel a pulsing or vibrating sensation, this could be due to worn out brake rotors. When the rotors become worn, the surface can become warped. This causes the contact of the brake pad with the rotor to be uneven. When this contact isn’t uniform, it can result in a pulsing or vibrating when you put pressure on the brake pedal.
- Rust or cracks: If your vehicle has been sitting for a long time, it’s possible that it’s accumulated some rust. Minor rust is not an issue; it gets polished away by the brake pads every time you drive. However, major corrosion on a rotor is a safety hazard and should be replaced promptly. Even more dangerous are cracks in the rotor. A cracked rotor can suddenly catch on the edge of the brake pad causing the wheel to seize, potentially causing an accident.
- Uneven surface: The surface of a brake rotor should be smooth and uniform. If you notice any obvious signs of wear like deep grooves or scratches, the rotors need to be replaced. This kind of damage is usually due to a driver neglecting to change the brake pads in a timely manner.
Do All Four Rotors Need To Be Replaced At Once?
It is not really really necessary to replace all of the rotors at the same time. The most economical thing to do is only replace rotors that really need to be replaced. Most often, the front and back rotors will wear evenly. Usually you will find that the front rotors will need to be replaced at the same time, while the back rotors might still have six months to a year of life left on them.
What About Turning The Rotors?
Turning off the rotors refers to the process of taking old worn, warped, or scratched rotors and grinding down the surface to make them smooth again. A special machine will remove the top couple of millimeters of metal of the rotor and polish them so they are perfectly even. This allows the brake pad to get a good contact with the rotor once more.
Turning of the rotors might not always be a viable option. For one, the cost of resurfacing the rotors may be comparable to just getting altogether new ones. Secondly, some rotors may be too worn out and unable to be salvaged by resurfacing. Thirdly, if the rotors were warped due to high heat, turning the rotors will remove material and make them thinner, thus making them even more vulnerable to being warped from heat stress. A bit of a conundrum.
Ultimately deciding whether to turn or completely replace your brake rotors depends on a few factors. If it’s time to get your brakes serviced, your brake warning dash light or check engine light is illuminated, talk with your local mechanics garage or mobile mechanic to help you decide upon the best course of action.