What's up with my rear rotor? - 2014+ Jeep Cherokee Forums
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post #1 of 12 (permalink) Old 05-09-2017, 01:03 PM Thread Starter
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What's up with my rear rotor?

So last week as I was filling up, I looked around, and noticed this on the rear rotor, and just now I remember to snap a photo of it.

The other three rotors look normal, but the passenger side rear rotor looks like this. I have also noticed a peculiar sound, almost like a squeaking/screeching sound at lower speeds (5-35 or so mph). I had originally thought it would be the rear transaxle, but after seeing this, I'm wondering.

When I touch that part of the rotor btw, it feels like I'm touching a vinyl record. I do use the parking brake on a frequent basis, so I'm curious if that might have something to do with it, but I notice nothing that seems indicate the brake is stuck.

What say you JCC?
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post #2 of 12 (permalink) Old 05-09-2017, 01:14 PM
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How many miles are on those and how brake-heavy are your normal routes? I've had that same thing happen on several vehicles, particularly in the rear. Sometimes a caliper can spread open ever so slightly over the years and miles, causing more pressure to be applied to the part of your brake pad nearest to the caliper body/furthest from the center of the rotor. Also vented rotors (I think our rears are vented) change shape ever so slightly when they get hot. The inner face expands more than the outer face, because the outer face is the one attached to the center hat. This causes the rotor to "cone", pressing the outer half of the friction surface into the brake pad a bit more than the inner.

Combine those two and you can get funny wear like you have. Some cars do it, some don't. It's nothing to really worry about (other than looks) unless the shiny part of the rotor or the pads are getting near their minimum thicknesses. Also once the inner area starts getting less pressure on it and rust starts, it'll never get shiny again and chews into the pad more.

Last edited by iwfur25; 05-09-2017 at 01:24 PM.
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post #3 of 12 (permalink) Old 05-09-2017, 01:17 PM
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Quote:
Originally Posted by Shoulder View Post
So last week as I was filling up, I looked around, and noticed this on the rear rotor, and just now I remember to snap a photo of it.

The other three rotors look normal, but the passenger side rear rotor looks like this. I have also noticed a peculiar sound, almost like a squeaking/screeching sound at lower speeds (5-35 or so mph). I had originally thought it would be the rear transaxle, but after seeing this, I'm wondering.

When I touch that part of the rotor btw, it feels like I'm touching a vinyl record. I do use the parking brake on a frequent basis, so I'm curious if that might have something to do with it, but I notice nothing that seems indicate the brake is stuck.

What say you JCC?
Foreign object causing issue? Or a caliper sticking?
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post #4 of 12 (permalink) Old 05-09-2017, 01:40 PM Thread Starter
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Originally Posted by iwfur25 View Post
How many miles are on those and how brake-heavy are your normal routes? I've had that same thing happen on several vehicles, particularly in the rear. Sometimes a caliper can spread open ever so slightly over the years and miles, causing more pressure to be applied to the part of your brake pad nearest to the caliper body/furthest from the center of the rotor. Also vented rotors (I think our rears are vented) change shape ever so slightly when they get hot. The inner face expands more than the outer face, because the outer face is the one attached to the center hat. This causes the rotor to "cone", pressing the outer half of the friction surface into the brake pad a bit more than the inner.

Combine those two and you can get funny wear like you have. Some cars do it, some don't. It's nothing to really worry about (other than looks) unless the shiny part of the rotor or the pads are getting near their minimum thicknesses. Also once the inner area starts getting less pressure on it and rust starts, it'll never get shiny again and chews into the pad more.
To my knowledge, these might even be the OEM brakes, so over 60k miles on them. They might have been replaced when the previous owner had them, but I don't have that information.

As far as how I brake, I don't normally slam on the brakes if that's what you mean. I do use my brakes a lot more than I ever did with my Mini due to the fact the Jeep doesn't engine brake that well. I suppose it's probably nothing too big, but I also have no way of knowing if there's a foreign object stuck between the pads and rotors. Generally, a rock or something stuck between the rotor and pad would make quite a lot of noise, almost ear-bleeding actually.

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post #5 of 12 (permalink) Old 05-09-2017, 01:52 PM
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My guess is that the pad is shot and missing material where the roughness is showing (inner portion). Not too uncommon and I am sure that is what you have been hearing. You may be able to replace the pads and turn the rotors, but it's not really worth turning them. It looks like it's time for brake service...

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post #6 of 12 (permalink) Old 05-09-2017, 02:07 PM Thread Starter
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Originally Posted by mults View Post
My guess is that the pad is shot and missing material where the roughness is showing (inner portion). Not too uncommon and I am sure that is what you have been hearing. You may be able to replace the pads and turn the rotors, but it's not really worth turning them. It looks like it's time for brake service...
If I get a chance this weekend, I'll take the wheels off to look over the rotors and pads as I can't really get a good look with them on. I'd also not be too upset if I have to get new brakes. 60k miles on OEM brakes and rotors is not too shabby, and I've done brakes and rotors before, so it shouldn't be too difficult. I might even snap a couple photos, and report back on what I find.

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post #7 of 12 (permalink) Old 05-09-2017, 02:16 PM
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yikes, 60k miles on factory brakes you're on borrowed time my friend. i needed pads and rotors by 40k miles, and my oem rotors were even turned by 11k miles. youre due for a brake job my friend!

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post #8 of 12 (permalink) Old 05-09-2017, 02:18 PM
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My guess is that the pad is shot and missing material where the roughness is showing (inner portion). Not too uncommon and I am sure that is what you have been hearing. You may be able to replace the pads and turn the rotors, but it's not really worth turning them. It looks like it's time for brake service...
That too.
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post #9 of 12 (permalink) Old 05-09-2017, 02:42 PM
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I agree, at 60k miles on the factory brakes it's time to have them replaced. Rotors MIGHT be okay and be able to be turned pads however are gone.

My 2016 fried a set of rotors at 14k miles and I put all new brakes on at 17k.

My 2014 had horrible looking rotors. But the dealer said they were fine. But at 60k you are overdue for brakes. You can get the parts for about 400$ or so rotors and pads. Dealer will charge you a fortune.


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post #10 of 12 (permalink) Old 05-09-2017, 03:00 PM Thread Starter
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I agree, at 60k miles on the factory brakes it's time to have them replaced. Rotors MIGHT be okay and be able to be turned pads however are gone.

My 2016 fried a set of rotors at 14k miles and I put all new brakes on at 17k.

My 2014 had horrible looking rotors. But the dealer said they were fine. But at 60k you are overdue for brakes. You can get the parts for about 400$ or so rotors and pads. Dealer will charge you a fortune.


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Like I said, I don't have a record of if the brakes were ever replaced before then. All I can guess is they weren't, and same goes for the tires as there are developing cracks along where the tread and sidewalls meet, so those are definitely going to get replaced this year. What I plan on replacing them with I have not decided. I'm looking at either the BFG KO2s, or the Cooper A/TWs, but there are other possiblities.

I'm not bothered by the brakes though as wear and tear items are going to happen at some point (They'll also come out of my expense fund, which is funded from all the driving I do for work). I'm looking to order new wiper blades, filters, and even diff fluid, so if the brakes need to be done, I'll tack those on when I order parts from mopar.

That being said, Len, would you recommend just getting new OEM pads and rotors, or would you suggest something different? I do recall some folks here talking about some better than OEM pads and rotors, so I'm curious whats your take on it.

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