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Old 01-16-2014, 05:04 PM   #1
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Grinding noise while braking

Hey folks-
Iíve got about 1,200 mi on the 2013 Sahara I got in December. Iím seeing an issue that I used to get on occasion in my 2004 Exploder. If I decelerate quickly into a turn, Iíll feel a pretty disturbing grinding in the brake pedal. I think I read somewhere that this might be ESP. Does that seem right?
I canít tell whether to feel relieved that maybe my Explorer wasnít as big of a death-trap as I thought, or to start sweating that the brand new Jeep I bought to replace it is just as big of a POS?
Any thoughts or advice would be appreciated.
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Old 01-16-2014, 06:19 PM   #2
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First I would isolate where the noise is coming from...front? Driver or passenger side? Once you pinpoint the noise remove the wheel and inspect the rotor. Is there a gouge in it? If so, there might be a rock caught in there. ESP definitely doesn't grind, and I will assume you are not using 4WD on a dry road correct?

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Old 01-16-2014, 06:40 PM   #3
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No 4WD on dry road, no.
The noise is really brief, and I can't seem to force it. I don't even know how much of a noise there is vs. the feeling in the brake pedal.
It's only ever happened (on either vehicle) while braking somewhat vigorously while turning somewhat abruptly. I'm not stomping the brakes and cranking the wheel, but it's not exactly driving like a grandma, either.
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Old 01-16-2014, 08:04 PM   #4
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Sounds like ESP/abs cutting in, very fast vibration in the brake pedal... It's possible there's a faulty sensor causing it to act up but if there's any slip in any wheels it will engage and possibly do what you're describing
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Old 01-16-2014, 08:31 PM   #5
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Pull wheels and check rotor/pad could have small stone wedged in there or a pad clip slipped, at 1200 miles doubt it would be pad wear, unless you have a stuck caliper
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Old 01-16-2014, 08:39 PM   #6
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Definitely have someone look at it because if it is the brakes/rotors/calipers you don't want to mess with those. It isn't necessarily a "Jeep being a pos thing" either - ie getting a rock wedged in there has nothing to do with Jeep-iness. I seem to recall I had a stuck caliper or some other brake calamity some years back on one of my old Mustangs (I have had a few lol). The end result was a quite expensive rebuild of nearly the entire brake system. (Eventually it ate through the rear brakes, leaving me with just fronts on a RWD, and then those nearly went.) Of course I was young and stupid and quite a bit poorer than I am now - had I spent the few dollars/hours and gotten them looked at early on, it may have been a much easier and cheaper fix.
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Old 01-16-2014, 09:14 PM   #7
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Quote:
Originally Posted by marslim View Post
Sounds like ESP/abs cutting in, very fast vibration in the brake pedal... It's possible there's a faulty sensor causing it to act up but if there's any slip in any wheels it will engage and possibly do what you're describing
ESP/ABS kicking in does give you a feedback through the steering wheel, but it doesn't make a grinding noise. If it's grinding, it should be easily replicated. The problem is, people have a hard time describing things in writing. When someone tells me it's a grinding noise, I assume it is a noise that is easily heard, not something that can be felt.

Can you record the noise if possible? With 1300 miles I would take it to the dealer. To address you calling the Jeep a POS, the wrangler's braking system is identical to every single car on the market, calipers, brake lines, master cylinder, rotors, and pads.
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Old 01-16-2014, 09:34 PM   #8
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What your describing sounds like the feeling you get when you have the Down Hill Assist activated and you press the brake pedal while the down hill assist is applying the brakes for you. Its a grinding feel.

Keep in mind downhill assist is only suppose to work at a certain down hill grade I think so if your on a flat road I wouldnt think i would kick in even if you press the button for it.
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Old 01-16-2014, 09:46 PM   #9
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For the record, I'm not saying my Jeep IS a POS. I just want to make that clear! I friggin adore this thing.
I just find it odd that my Explorer and JKU are the only vehicles I've owned that exhibit this behavior. Perhaps not so odd, as they're the only ones with ABS, traction control things, 4 wheel discs, etc.
I'll check out the discs.
I may be projecting the "noise" of it, but it really feels gross. I'll try to force it this weekend.
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Old 01-16-2014, 09:53 PM   #10
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Quote:
Originally Posted by NFRs2000NYC View Post

ESP/ABS kicking in does give you a feedback through the steering wheel, but it doesn't make a grinding noise. If it's grinding, it should be easily replicated. The problem is, people have a hard time describing things in writing. When someone tells me it's a grinding noise, I assume it is a noise that is easily heard, not something that can be felt.

Can you record the noise if possible? With 1300 miles I would take it to the dealer. To address you calling the Jeep a POS, the wrangler's braking system is identical to every single car on the market, calipers, brake lines, master cylinder, rotors, and pads.
I was going by craniums second post there where they said not sure how much noise there is as much as feeling through the pedal... But like you say it's hard to tell from a description. I worked at a Chrysler dealer for 3 years and always dreaded having someone try to explain a sound or a feeling, it's tough.
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Old 01-16-2014, 10:47 PM   #11
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It is tough to describe sounds (and I've spent many years as a sound designer!)
Grinding is the best I can describe when I've heard it, but not the kind of typical metal on metal grind folks might be accustomed to.
I'll have to be more attentive, and it hasn't happened in a couple days. It's a very bizarre feeling to me in the pedal. Not like old drum brakes grinding, or something like that. The reason I could believe it's something ESP-like is because it almost feels disconnected from the brakes. So if I really think about it, I could see it being the result of my application of the brakes fighting against and in-process application of the brakes from some robot overlord living under the hood.

I really was just wondering if this was another one of those things I'd come on here and read a bunch of posts about, but I didn't find much mention of it.
I guess I'm kind of a hypochondriac, even with my cars. But it's my first brand new vehicle, and I trip on every little creak. Any of my old cars, yeah... I expected stuff to make noises, or feel loose, etc., but with this thing, when I get home and shut the engine off and it makes a new sound I haven't heard in the past 3 weeks, I come here and search, and hope it's not some crazy thing that'll need a replacement head or something. So... Yeah. Gonna go search for that noise now, too.

Thanks all for your responses. I'll be heading back to the dealership in the next few days to take them the Ford's title, so I'll try to schedule some service time, too.
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Old 01-17-2014, 11:53 AM   #12
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I'm going to go out on a limb here and say you're experiencing ABS kicking in. You can feel the brake pedal pulsating while you're braking hard. ABS is trying to keep from your wheels locking up while braking hard. You're wheels have significantly less traction during a turn taken at speed.
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Old 01-17-2014, 04:20 PM   #13
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Quote:
Originally Posted by trailless View Post
I'm going to go out on a limb here and say you're experiencing ABS kicking in. You can feel the brake pedal pulsating while you're braking hard. ABS is trying to keep from your wheels locking up while braking hard. You're wheels have significantly less traction during a turn taken at speed.
Transferred to Jeep from a succession of 'normal' street cars. Jeep is the first 4x4 that I've had with ABS. It's also the first car that I've ever had the ABS cut in dry except in an emergency. Probably the high centre of gravity and chunky tyres. I've learned to brake more gently and it's not happening now.
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Old 01-17-2014, 10:07 PM   #14
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Wheel Speed sensor bad, road is actually wet, your tires suck, or your are driving like an a$$hat. - But option 1 sounds about right. Maybe not the wheel speed sensor, but some other. Who knows, but from what you describe your ABS is clicking in - and you state that the road is dry so that should not happed. Get it all the time here on snow /ice ....
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Old 10-05-2015, 11:18 AM   #15
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I own a 2012 Sahara with the same problems. It has occurred since I bought it. I now have 43,000 miles on it. I've taken it in to Jeep who always gives me the all clear. It's most likely the abs/computer. The biggest hiccup is I offroad quite a bit and in the steep decents in low range that are technical, I have found pumping the breaks works. The breaks do recover, otherwise they tend to go to the floor. I do have it lifted which contributed to the problem. I realize that the breaks are designed to help going down hill in low range but I think Jeep didn't quite get it right!
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Old 10-05-2015, 11:26 AM   #16
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When was the last time the brake pads and rotors were inspected or changed on your Jeep?
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Old 01-04-2016, 11:48 PM   #17
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Did you ever figure out the problem? I have the same exact issue on my 2012, and I've had the problem since it was new. Dealer couldn't replicate it at the time, so they said everything was fine. I think it's ABS, it feels just like ABS, but I don't understand what is causing it or how to fix it. It happens in both left and right turns, usually only up to 30mph, and really bad if I'm turning onto and incline.
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Old 01-06-2016, 07:14 AM   #18
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I've had this happen in a few vehicles of mine with stability control. I take some turns really sharp sometimes. So the computer gets a signal that the steering wheel angle was abruptly turned while the car is still moving in another direction, so the computer brakes the front tire to prevent a potential skid.
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Old 01-06-2016, 07:42 AM   #19
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I also have had this problem with my 2007 JK/PJ(Pearl Jam Edition). It usually happens on on/off ramps that are filled with pot holes and a semi-sharp angle. My break pedal goes crazy and I get the "grinding" noise. I had the dealer fix it years ago, they replaced the sensor and I have the same problem. As irritating as this feature is, it has saved me numerous times on wet/oily/snowy roads. W/o disabling this feature I beat it by driving correctly. Watch your entry and exit radius going into turns (no quick steering adjustments) and keep you speed low. The Camry behind you might get pissy b/c your only going 30 when he wants to go 50, but who cares: he's driving a Camry w/ a fart can on the exhaust. When he passes you staring, drive over the top of him hahahahahahahah.
Hope this helps
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Old 01-06-2016, 07:43 AM   #20
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Oh and the ABS activate/deactivate button will not stop this either it has to be "hard" disabled.
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Old 01-06-2016, 09:42 AM   #21
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Pretty sure it's the ESP/ABS. This forum and about a dozen others have fueled that belief.
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Old 01-06-2016, 05:58 PM   #22
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I just had this problem on my wife's Jeep. the bottom pin on the caliper was stuck, forcing the caliper to twist on the caliper. tore apart, cleaned and lubed the sliding caliper pins and put on new pads (bought them just in case) problem solved.
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Old 01-06-2016, 07:37 PM   #23
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I was wondering if that could cause it. I'll pull it apart this week and see if that fixes it.



Quote:
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I just had this problem on my wife's Jeep. the bottom pin on the caliper was stuck, forcing the caliper to twist on the caliper. tore apart, cleaned and lubed the sliding caliper pins and put on new pads (bought them just in case) problem solved.
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Old 01-06-2016, 09:01 PM   #24
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Definitely the audible ABS sounds.. I wonder if those experiencing this over reacting technology have off centered steering wheels (or bad steering wheel sensors?) and stability control is easily triggered?
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Old 01-06-2016, 09:20 PM   #25
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I'm positive my steering wheel is perfectly, or very nearly perfectly, centered. It could be a bad ABS sensor, but I'm not getting any codes, and ABS works fine when it's actually supposed to work. My issue happens at variable speeds, as slow as 5mph in a parking lot when turning into a parking space, and up to 30mph or so when turning. It's been this way since before I lifted it or made any modifications, but it was made worse after putting 35's on. I'll post after I grease the caliper pins.

Also, the abs, esc, or any other lights do not come on when the problem occurs.
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Old 01-07-2016, 12:08 AM   #26
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I have the same thing on my 2015. It has completely stock suspension, wheels, and tires. Up to about 2600 miles. I am almost 100% certain it is ABS, but I can't ever catch the light flickering or anything, and I can't reliably force it to happen. I'm going to pull my wheels this weekend and see what's up. Thankfully it doesn't happen often enough to really concern me, but I'd love to get to the bottom of it.
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Old 01-07-2016, 03:27 AM   #27
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Thanks god i finally find others with same problem. I thought i was getting nuts. Well may be im but the good thing not from this problem .

So i ve had this same grinding noise on my 2013 when braking fast in very unique occasions, mostly on bumpy roads or turns. That grinding is very strong but it goes away before full stop. Only kicks in for a few seconds. Its doesn't happen often enough to make me take it to dealership, plus im sure they won't do anyth about it because it won't do that grinding sound in there.
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Old 01-07-2016, 04:01 AM   #28
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Quote:
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Definitely the audible ABS sounds.. I wonder if those experiencing this over reacting technology have off centered steering wheels (or bad steering wheel sensors?) and stability control is easily triggered?
Lights would be flashing. Happened to me a couple times with off center wheel
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Old 01-07-2016, 03:35 PM   #29
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^ good to know

These JK do some goofy stuff. Keep us posted
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Old 01-07-2016, 04:47 PM   #30
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I have it also on my 2015 JK X-edition. Its just the ABS that is kicking in...Brake hard on a wet road and you will feel the same thing...
The thing is that the computer is sometimes to smart and helps in places you do not expect..

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