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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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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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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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