Constant rattling noise only stops when step on brake, ideas? - LotusTalk - The Lotus Cars Community
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post #1 of 16 (permalink) Old 07-23-2017, 05:55 AM Thread Starter
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Constant rattling noise only stops when step on brake, ideas?

As the title says, the car develops a rattle noise from somewhere internal the front console. It has been about 6 months now. The rattle only appears at low speed, and it is not significant but enough to annoy the heck out of me and the passenger. It will go away as soon as I lay my foot on the brake pedal. I've checked everywhere underneath the console and the pedals, all wires are secured and nothing loosen. Anyone shares the same rattle?

Thanks,

Sam
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post #2 of 16 (permalink) Old 07-23-2017, 07:20 AM
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What year elise? Is the noise inside or outside the car?
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post #3 of 16 (permalink) Old 07-23-2017, 07:24 AM
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brake pedal return spring?
missing the little rubber bump stop for the pedal?
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post #4 of 16 (permalink) Old 07-23-2017, 07:45 PM
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I have the same issue with my 06 Elise


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post #5 of 16 (permalink) Old 07-23-2017, 08:09 PM
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One time I had this and my lug nuts were loose. Sounded so much like it was in the dash

2007 Exige S with almost every track mod...
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post #6 of 16 (permalink) Old 07-23-2017, 08:13 PM
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Sounds like loose brake pads. Pads like pagids etc are smaller to allow for heat expansion and they rattle like anything. Try some 3m stick on brake shims on the back of the pads and on either side of the caliper to make it go away.


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post #7 of 16 (permalink) Old 07-23-2017, 11:28 PM
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Is it pretty noticeable? I have a noise at low speed similar area, like loose change or loose hardware. Not noticed if it goes away with braking. It is pretty faint. If I had the stock exhaust it would be easier to hear it.

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post #8 of 16 (permalink) Old 07-24-2017, 04:24 AM
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Probably not your issue, but this caused a very loud rattle until I would hit the brake pedal:

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post #9 of 16 (permalink) Old 07-24-2017, 08:46 AM Thread Starter
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Quote:
Originally Posted by breeze91 View Post
Sounds like loose brake pads. Pads like pagids etc are smaller to allow for heat expansion and they rattle like anything. Try some 3m stick on brake shims on the back of the pads and on either side of the caliper to make it go away.


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I will try to take it to a check up asap. Thanks!


Thanks guys, I guess I'm not alone on this issue. The car is a 2011 Elise SC. As for the noise, I can't tell if it's from outside or inside, but definitely from the front. The noise doesn't happen until driving for a while, ie, the noise happens after 15 mins or so. All the lug nuts should be tightened and the car drives and stops fine.

Sam
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post #10 of 16 (permalink) Old 07-24-2017, 10:03 AM
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Sure sounds like front brake pads to me.

I've had success with using the CRC Brake Quiet (orange goop) on my pads. I've used them both on the Lotus and the Tesla...and have no issues with pad squeaks, squeals, or rattles.

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post #11 of 16 (permalink) Old 07-24-2017, 10:24 AM
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Not sure if it will be a cure for the OP's issue but I have a bottle of that stuff and have used it for years. Works well and a bottle will last you a lifetime!

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post #12 of 16 (permalink) Old 07-25-2017, 05:36 AM Thread Starter
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Thanks guys! Really appreciate the help! I went to do a quick check up on the brake myself this morning, and found out that the front brake pad can be moved by a tiny bit with a push from using a pen, whereas the rear pads are firm and can't be moved by outside force; however, I'm still not 100% sure the noise are from the front pads, because the noise are quite loud, and I'm not sure that it can be made by the tiny movement from the pads.

I will further look into this, keep this issue updated.

Sam
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post #13 of 16 (permalink) Old 07-25-2017, 07:21 AM
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Quote:
Originally Posted by Mobius97 View Post
Not sure if it will be a cure for the OP's issue but I have a bottle of that stuff and have used it for years. Works well and a bottle will last you a lifetime!
Yep, this is great stuff. I use it on every brake job I do.

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post #14 of 16 (permalink) Old 10-19-2017, 07:38 AM Thread Starter
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Updates: Prior to my another track day coming up, I took my car to another inspection, especially focused at front suspension.

Surprisingly, the mechanics found that the bolts for the upper control a-arms are slightly loosened. Although without a torque wrench, the mechanics were able to tighten the bolts a bit more with a short wrench by hand measure (I guess could be around approximate 50 lbs). I didn't look into the service manual, but to my little knowledge, these bolts should be torqued some where over 50lbs.

The front suspension upper control a-arms are now tightened (by hand measure). After the repair, the rattle was disappeared at first, but after 30 mins testing, it still appears at low speed (30 km/hr) with clutch in or out, and the noise is especially profound at 2-3rpm; however, the noise is significantly lowered. I will keep on finding if any bolts are loosened and later try the "disc brake quiet".

Sam
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post #15 of 16 (permalink) Old 10-19-2017, 08:44 AM
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I've experienced 'loose pad rattle' on any number of cars over the years.



And yes, my bottle of Disc Brake Quiet has lasted me about 30 years, so far. (Purchased in the 1980s)

Nice to know that my life is not about to end, any time soon! The lifetime bottle is more than half-full.

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In the post above, do you mean 2000 - 3000 RPM? Are you implying that an engine speed vibration makes the noise more noticeable independent of actual vehicle speed? If so I'd broaden my investigation. Perhaps a retainer for a metal brake line? Fender inner liner? <---Just a couple W.A.G.s

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post #16 of 16 (permalink) Old 10-19-2017, 09:31 AM
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The upper control arm bolts to the chassis? Or to the upright.

The inner are 33 ft lbs and the outer are 60? I think if you have upgraded to 10.9 bolts

That being said you MUST replace the bolts that were loose before you track it. They arent meant to carry load while loose.
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