Brakes making "SHHHH" noise - LotusTalk - The Lotus Cars Community
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post #1 of 43 (permalink) Old 02-20-2012, 12:08 PM Thread Starter
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Brakes making "SHHHH" noise

I have been around cars long enough, but never heard something like this. Noise developed after picking up car from body shop. Have driven the car 110 miles since.

Car has new rear OEM pads.

Car has fresh brake fluids

Front pads have plenty left.

When driving at 70mph, press brake, no noise, all is fine, car stops perfect. However, as you approach 20mph, there is a "SHHHHH" noise till the car comes to complete stop. If I let go off the brake pedal, noise goes away.

I have done some HARD stops to see if changes anything, nada.

Appreciate any help. Noise is not a squeak or anything.

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post #2 of 43 (permalink) Old 02-20-2012, 12:48 PM
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You probably know this, but sometimes debris (like small stones) can get trapped between the rotors and calipers. Often simply reversing for a few yards can dislodge it. Depending on what work they were doing, the body shop may have dropped something in there or bent something out of place...

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post #3 of 43 (permalink) Old 02-20-2012, 01:08 PM Thread Starter
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Body shop replaced the rear clam.

Ok thanks, I will take a look closely and report back. I appreciate the post.

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post #4 of 43 (permalink) Old 02-20-2012, 02:11 PM
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Does gently applying the handbrake affect the noise?

Does noise occur when you first start out or only after driving a bit?

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post #5 of 43 (permalink) Old 02-23-2012, 10:22 AM Thread Starter
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GLB

Noise is not effected with the handbrake--that is what I thought first..that its a stuck brake...that is what it sounds like really noise wise.

Noise is constant..when I first start out car, or after driving 2 hours.

I checked all the pads/rotor area, nothing. Also did the reverse as suggested, no improvment.

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post #6 of 43 (permalink) Old 02-23-2012, 01:16 PM
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Quote:
Originally Posted by lotuscupcar View Post
GLB

Noise is not effected with the handbrake--that is what I thought first..that its a stuck brake...that is what it sounds like really noise wise.

Noise is constant..when I first start out car, or after driving 2 hours.

I checked all the pads/rotor area, nothing. Also did the reverse as suggested, no improvment.
New brake pad material too thick, causing dragging?
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post #7 of 43 (permalink) Old 02-23-2012, 01:22 PM
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Now, I can only surmise that the Shhhh sound is the car telling you to talk less....

Did you buy it from a librarian?

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post #8 of 43 (permalink) Old 02-23-2012, 01:33 PM
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That just means they're quiet...... it's when they go aaarrrghhhssccreeeee that you have to start worrying

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post #9 of 43 (permalink) Old 02-23-2012, 01:45 PM Thread Starter
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Quote:
Originally Posted by metrocube View Post
New brake pad material too thick, causing dragging?
Don't t hink so. Rear pads are new OEM. They have been on the car a year, but car has had 0 miles all last year.

Started driving it again, no issues. This noise was never there. After driving home from body shop, this has started.

I am perplexed Yes it sounds like dragging, but only when applied at slow speed, no noise at other times. Plus going high speed (exit ramp), putting clutch in, car really doesn't slow down...it would if brakes were dragging or "stuck."

If I can't figure it out, time to take it to a mechanic.

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post #10 of 43 (permalink) Old 02-27-2012, 02:12 PM Thread Starter
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Dropped car of at mechanic, once I hear back, will report back what the issue is.

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post #11 of 43 (permalink) Old 02-27-2012, 02:35 PM
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If your car sat a long time, is there rust on your rotors still?

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post #12 of 43 (permalink) Old 02-27-2012, 02:39 PM Thread Starter
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No rust. Car sat for 18 months or so, climate controlled garage, covered. Drove it 200 miles, no issues.

Then went to body shop. Was there 12 weeks. Sound since then.

No "visible" rust as I can see.

Since body shop car was driven now (as of this AM) total 200 miles. Now to mechanic. The noise sounds like a SHHH=static AM radio noise....hard to describe, definitely brake related, and definitely only happening at low speeds.

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post #13 of 43 (permalink) Old 03-03-2012, 06:29 PM
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my car does the same thing and has since new, it is a pampered pet. when i was younger and built rods i heard the same thing from frames i would push around without and engine. i don't think it's anything to worry about at all, in fact i thought it was just a natural sound from a minimalist car.

bz
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post #14 of 43 (permalink) Old 03-03-2012, 07:02 PM
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What kind of front pads are on the car? A metallic pad is noisier at low speeds. My Ferodos are "shhooshier" than the OEMs.
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post #15 of 43 (permalink) Old 03-04-2012, 08:13 AM Thread Starter
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Quote:
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What kind of front pads are on the car? A metallic pad is noisier at low speeds. My Ferodos are "shhooshier" than the OEMs.
Car has OEM pads front and back.

Also I am original owner and the car never made this noise prior

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post #16 of 43 (permalink) Old 04-03-2012, 10:59 AM Thread Starter
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UPDATE

Worked on car with another Lotus owner, and we did some inspections

Rear rotors are 25.7
Front rotors are 25.5

Front pads are 90%
Rear pads are 45%

Everything looks normal. Few people said sound is normal (though never had it when new).

So I guess just back to driving.

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post #17 of 43 (permalink) Old 04-20-2012, 05:54 PM
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same

Mine do the same thing.
If you roll down a hill in neutral (maybe even turn off the engine), it is very prominent. I have metallic pads, so this may exacerbate the effect.

I AM concerned about this issue. I heard somewhere that brake manufacturers design calipers so they drag a bit in order to create heat in the pad/rotor.
The purpose is so your brakes are not cold when you need to stop in an emergency situation where full braking force is required.

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post #18 of 43 (permalink) Old 04-21-2012, 10:24 AM
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I have pagid's on mine.. i have the same SHHHHHHH sound and also occur doing low speeds or during really cold mornings. However, they only make this sound a few minutes after I start driving... once warmed up I either don't notice them as much or the sounds goes away.

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post #19 of 43 (permalink) Old 05-06-2012, 07:56 PM
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Do you think you could catch a sound bite of this? I just encountered a braking noise that is hard to describe. (https://www.lotustalk.com/forums/f101...-noise-114820/)

If this is normal I will be severely disappointed...

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post #20 of 43 (permalink) Old 05-07-2012, 09:33 AM
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Quote:
Originally Posted by lotuscupcar View Post
GLB

Noise is not effected with the handbrake--that is what I thought first..that its a stuck brake...that is what it sounds like really noise wise.

Noise is constant..when I first start out car, or after driving 2 hours.

I checked all the pads/rotor area, nothing. Also did the reverse as suggested, no improvment.
Mine are a bit noisy at low speed but only if I haven't used the car for a week or so.

The sound disappears after 20 or 30 minutes.

If I drive the car the following day, there is no sound or perhaps a bit but only for the first stop or two.

My brakes are all OEM.

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Last edited by David Craig; 05-07-2012 at 09:33 AM. Reason: spelling
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