Grinding Sound - Brakes? - Hyundai Forums : Hyundai Forum
 
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post #1 of 5 (permalink) Old 04-24-2019, 02:27 PM Thread Starter
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Grinding Sound - Brakes?

We have a strange grind sound that only happens when making a hard stop. Can't tell if its from the front or rear but my guess would be front. The car only has 40k miles. When we got new tires a few months ago, the tire store tech called me over to show me the front calipers and based on his view of the distance between the front of the caliper bracket and the rotor it needed new pads. I could see that it looked like the bracket was almost sitting on the rotor. I should have asked him to measure the pads. He said the rear pads were ok. The rotors were not scored nor are they warped. Slow to moderate stops are firm and quiet.


Now, I was into the Hyundai dealer last week for some other work and he apparently did measure the pads and he said they were only in the "yellow" category on the safety report. He said I'd be good till the next service interval. I think he mentioned 5mm thickness? I told him about the grinding and he didn't know, said maybe its a hub.


The noise that happens on a hard stop is a metal grinding sound. So who do I believe? Could it be another part besides brakes?

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post #2 of 5 (permalink) Old 04-26-2019, 01:38 PM
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Pads may have worn sufficiently that the brake wear tab is now contacting the rotor. This is designed to alert the driver that pad replacement is imminent.
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post #3 of 5 (permalink) Old 04-26-2019, 01:59 PM
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5mm is 1/2 of original pad thickness new in box.. grinding sounds when on pedal for hard stop,, could be simple friction co-efficient mis-match between pad material and friction face of rotor,, or pads riding rust rings (usually seen at inside face of rotor,, or rotor face look like alligator hide for rust

Need little better visual to see what going on

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post #4 of 5 (permalink) Old 04-27-2019, 02:05 AM Thread Starter
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The wear tab wouldn't be contacting the rotor, its not squealing. Those wear tabs make it squeal but when you step on it, then it goes away because the caliper shifts position, right? The friction surface of the rotor does not look rusted or scored but now that you mention it I think there is a rust ring near the inner or outer edge of it. I'd have to take a closer look.

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post #5 of 5 (permalink) Old 04-27-2019, 02:24 AM
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Pads are cheap. I have seen many cars wear one pad more than the others and also wear at an angle. If you know what your doing remove the pads from the wheel that's making the noise and have a real look. The rotor surface would also have some damage if the pads are metal to metal. What sbr11 said about coefficient problems yea been there on many occasions with aftermarket pads and believe me theirs no cure but to try another brand.
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