Rotor Won't Fit Back on After Brake Change on Mercees

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Signs that Your Brake Rotors Need to Be Replaced

May 4, 2017

Replacing brake pads is a pretty straightforward car repair, and everyone knows they need to be replaced periodically. But what about brake rotors? They're a more serious repair but no less important to replace when needed. In total, there are four brake rotors — one for each wheel. Rotors may need to be replaced anywhere from 15,000 to 70,000 miles. Here are some signs your Mercedes is ready for new brake rotors.

Shaking When You Brake

If the car shakes every time you brake, it could be a sign of failing rotors. This may be caused by rotors that are twisted or warped. It could mean the brake pads are having a problem meeting the rotors, which is why they're causing problems. Any unusual vibrating while braking should be looked at.

Noisy Brakes

Though sounds don't always accompany bad rotors, a squealing or squeaking sound could be a sign of a bad rotor. Squealing accompanies a warped rotor, while worn-out rotors are more likely to produce a scraping sound. The problem is that sometimes it's brake pads, which need to be replaced, that produce these sounds and not necessarily a rotor. For that reason, you might want to inspect the rotors.

Grooves and Score Marks on the Rotors

If you suspect your rotors might need to be replaced, then take a look. Rotors sit right behind your wheels; they're a disc-like object that spins around as you drive. If you can't get a good look, rotate the steering wheel to the right or left to get a better angle.

Because the brake pads are pressed against the rotors to slow down your car, it is not surprising to learn that rotors are going to wear out over time. That's just how it is. As you inspect your rotors, look for grooves and scoring the brake pads caused. A good rotor will look very smooth and unmarked. If you see grooves or scoring, or both, on the rotors, the fact of the matter is they will likely need to be replaced. If not now, then soon.

Rotor Is Too Thin

If you are unsure whether the rotors have worn enough to need replacing, measure their thickness. This is done with a micrometer across the center of the rotor. If the thickness is above the minimum thickness according to the manufacturer, then they can be skimmed to smooth out any problem areas. However, if the rotors are thinner than the minimum, you will want to replace them.

Though replacing the rotors can be an expensive repair, it is an essential part in the safety and care of your Mercedes and worth the investment. If you want to keep your rotors healthy, make sure you don't ride your brake and use greater distance when you need to come to a stop. If there's a red light up ahead, take your foot off the gas pedal and coast for a while, only applying the brake as you get closer to the car in front of you.

Image by IQRemix, Licensed via CC BY 2.0

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