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What is this sound?

What is this sound?

The sound is coming from the rear. Only happens when I put the car in gear and park. The sound is not present when I change gears.

Just had rear unit replaced.

Mobile folks will answer tomorrow and was wondering if anyone has heard this before.

https://1drv.ms/u/s!AihnWpuO55swiYpWcrxyESO-ihEGPw?e=sbVEqq

ALSET | August 28, 2019

Almost sounds like one of the handles retracting. Weird.

Silver2K | August 28, 2019

It's under the car in the rear. I wonder if a parking brake motor is going bad or the gear is bad in the refurb or new drive unit

barrykmd | August 28, 2019

never heard anything like that before.

Is it you zippering your special shorts?

Silver2K | August 28, 2019

Actually farting with shorts on. May be a thread fluttering :)

AIA304 | August 28, 2019

Sounds like parking brake engaging, but something is quite different. My bet parking brake issue

Silver2K | August 28, 2019

It's the parking brake on passenger side. I will have my mechanic remove the servo for now

Silver2K | August 28, 2019

Has anyone working the park brake? Do I need to apply firmware after replacing? It seems easy to replace.

Silver2K | August 28, 2019

Has anyone working the park brake? Do I need to apply firmware after replacing? It seems easy to replace.

NKYTA | August 28, 2019

Not heard that one, and certainly not on TTS list of sounds. Freak out!

DanFoster1 | August 28, 2019

Electric screw style parking brakes are common—I’ve never replaced one on a Tesla, but they’re nearly identical to others I’ve replaced. In my experience, they calibrate automatically. On a Tesla, you may need to power off after you replace the failing one.

Note: Most Tesla owners already know this, but for others reading this forum: Teslas don’t change gears. The gear box is simply a reduction gear-set: one ratio, no clutch, no torque convertor, no method of disengagement at all, no parking pawl. So in the gear box, Park, Reverse, Neutral and Drive are all exactly the same. The noises one hears when selecting a direction of travel come from the electric screw style parking brakes and the door handles, since those are the only things that actually move when the direction lever is actuated (and even then, they only move when selecting out of ‘Park’ or into ‘Park’.)

Silver2K | August 28, 2019

Dan , I thought the sound my be coming from transfer of power through or to the inverter via the new HV cabling. At first it sounding like an electric power hum.

RandallKeith | August 28, 2019

Mobile service replaced my parking brakes in my driveway. Car was still under warranty. Drivers side went out but he replaced both sides. No cost to me. I watched very carefully. Very easy job, couple of bolts and unplug the wires. Taking the wheel off and putting it back on took longer than replacing a brake. He plugged a laptop into my car when he replaced the 12 V battery, I don’t recall him doing anything when he replaced the parking brakes.

murphyS90D | August 29, 2019

It is definitely the parking brakes. They have to be released or they won't come off of the rotors. That means tow mode and wheel chocks until it is raised on a lift.

murphyS90D | August 29, 2019

It just occurred to me that the sound is the normal sound of application and release. Why do you think there is a problem?

Silver2K | August 29, 2019

murphy, it's making a very loud humming noise. that's not normal at all.

Silver2K | August 29, 2019

NKYTA | August 28, 2019
Not heard that one, and certainly not on TTS list of sounds. Freak out!
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https://www.youtube.com/watch?v=0RgroIMOH2M

Silver2K | August 29, 2019

wouldn't I get a message warning me about the park brakes needing service?
there is a module that manages the park brakes.

TeslaTap.com | August 29, 2019

Late to the party, but agree with others - never heard it before. Parking brake sounds like a good guess. Silver, have you had someone listen by the rear tire while you start up the car. Should be a lot louder outside the car, and you should be able to identify if it's a handle or the brake. Another possible idea is the rear charge port - I think it has a motor too (on the newer ones without the magnetic latch). If something wrong with it, perhaps it might make that noise.

RandallKeith | August 29, 2019

When my parking brakes went out I got a warning flag.

RandallKeith | August 29, 2019

Also, the mothership diagnosed the problem over the air and had a ranger in my driveway the next day.

Silver2K | August 29, 2019

TT, definitely not a handle and never thought it was. I've have many go, so now I'm a pro on handle sounds :).

I had someone listen to the passenger side this morning and it's definitely the parking brake on passenger side.

The sound recording was done with my phone placed near the drive unit.

RandallKeith | August 29, 2019

There was a factory recall on parking brakes. It affects certain production dates. I wasn’t part of it. My ranger had a truckload of them that’s why I was able to get mine replaced next day.

lilbean | August 29, 2019

Isn't that the sound of your special all-purpose tool?

Silver2K | August 29, 2019

That's what I use on that sound! ;)

Bighorn | August 29, 2019

Doves crying?

Silver2K | August 30, 2019

Sounds like a cow... Moooow