Curious Sound: Am assuming it's Normal?

smarano · 10-21-2006, 03:27 PM

Just wanted to verify that it is normal for the Prius to emit a 2-3 second whirring or rapid ticking sound (like the sound one of those egg timers might make while it's winding down) under certain conditions when you press the brakes. It dosn't happen every time, but usually when you apply them after a sustained period of no braking (e.g. when on highway). I'm assuming it's the regenerative brake system kicking in?

**Tideland Prius** · 10-21-2006, 03:54 PM

It should be normal. Try this next time. Have the rear seats folded down, turn off the radio and start the car up. You'll hear all the relays clicking behind you!

smarano · 10-21-2006, 10:51 PM

<div class='quotetop'>QUOTE(Tideland Prius @ Oct 21 2006, 03:54 PM) [snapback]336152[/snapback]</div>

Quote:

It should be normal. Try this next time. Have the rear seats folded down, turn off the radio and start the car up. You'll hear all the relays clicking behind you!
[/b]

So THAT's what those noises are! And I was thinking they were the sound of squirrel feet
as they ran out from under the car (grin).

Randall Rash · 10-21-2006, 11:27 PM

Ha Ha!

qbee42 · 10-21-2006, 11:31 PM

It's not the regen brakes, it's the hydrolic brake system building pressure. It runs from an electric pump, since the engine is not always running on a Prius.

Tom

**Tideland Prius** · 10-21-2006, 11:40 PM

<div class='quotetop'>QUOTE(stevejm @ Oct 21 2006, 07:51 PM) [snapback]336270[/snapback]</div>

Quote:

So THAT's what those noises are! And I was thinking they were the sound of squirrel feet
as they ran out from under the car (grin).
[/b]

or those mice and hamsters from Pinto Girl's thread on horsepower increase hehe.

Randall Rash · 10-21-2006, 11:42 PM

<div class='quotetop'>QUOTE(RandallRash @ Oct 21 2006, 10:27 PM) [snapback]336281[/snapback]</div>

Quote:

Ha Ha!

[/b]

hdrygas · 10-22-2006, 01:15 AM

<div class='quotetop'>QUOTE(stevejm @ Oct 21 2006, 07:51 PM) [snapback]336270[/snapback]</div>

Quote:

So THAT's what those noises are! And I was thinking they were the sound of squirrel feet
as they ran out from under the car (grin).
[/b]

Yes squirrels are ultilzed, but none are harmed in the Prius.

jmccord · 10-22-2006, 01:35 AM

Speaking of curious sounds...am I the only one who hears the climate control system when in cooling mode?
I'm not talking about the fan. Rather it sounds like a Star Trek version of vents opening and closing. Hard to pinpoint origin. Sounds like it's coming from behind the front seats

**Tideland Prius** · 10-22-2006, 02:32 AM

There are rear seat vents under the front seats.

Also, when you open/close the outside vent, on my car, I can hear the vent cover (flap?) moving. It creaks <_<

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10-21-2006, 03:27 PM	#1
smarano Member Join Date: Sep 2006 Posts: 50 My Car: Model: Package: Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	Just wanted to verify that it is normal for the Prius to emit a 2-3 second whirring or rapid ticking sound (like the sound one of those egg timers might make while it's winding down) under certain conditions when you press the brakes. It dosn't happen every time, but usually when you apply them after a sustained period of no braking (e.g. when on highway). I'm assuming it's the regenerative brake system kicking in?

10-21-2006, 03:54 PM	#2
Tideland Prius Moderator of the North Join Date: Oct 2004 Location: Canada Posts: 19,633 My Car: 2010 Prius Model: N/A Package: Technology Package (Canada) Thanks: 229 Thanked 346 Times in 245 Posts Friends: 23	It should be normal. Try this next time. Have the rear seats folded down, turn off the radio and start the car up. You'll hear all the relays clicking behind you!

10-21-2006, 11:27 PM	#4
Randall Rash Senior Member Join Date: Sep 2006 Location: Rockwall, TX Posts: 113 My Car: 2010 Prius Model: IV Package: Solar Roof Thanks: 33 Thanked 15 Times in 9 Posts Friends: 0	Ha Ha!

10-21-2006, 11:31 PM	#5
qbee42 Senior Member Join Date: Mar 2006 Location: Northern Michigan Posts: 10,487 My Car: 2006 Prius Model: Package: #7 Thanks: 95 Thanked 392 Times in 290 Posts Friends: 10	It's not the regen brakes, it's the hydrolic brake system building pressure. It runs from an electric pump, since the engine is not always running on a Prius. Tom

10-22-2006, 01:35 AM	#9
jmccord Join Date: Nov 2005 Location: San Diego, CA, Earth Posts: 199 My Car: Model: Package: Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	Speaking of curious sounds...am I the only one who hears the climate control system when in cooling mode? I'm not talking about the fan. Rather it sounds like a Star Trek version of vents opening and closing. Hard to pinpoint origin. Sounds like it's coming from behind the front seats

10-22-2006, 02:32 AM	#10
Tideland Prius Moderator of the North Join Date: Oct 2004 Location: Canada Posts: 19,633 My Car: 2010 Prius Model: N/A Package: Technology Package (Canada) Thanks: 229 Thanked 346 Times in 245 Posts Friends: 23	There are rear seat vents under the front seats. Also, when you open/close the outside vent, on my car, I can hear the vent cover (flap?) moving. It creaks <_<