Need help identifying noise behind dash

Truffles · 05-19-2006, 09:31 PM

Hello,

I have a 2006 with about 7800 miles. There is a noise that I can't seem to identify that seems more pronounced over the last few days.

It's coming from behind my dash, right on the other side of my speedometer. It sounds like a pump of some sort is activating. It can happen every couple of minutes and it lasts around 5 seconds. It seems to be more common at slower speeds, but this could be just due to less road noise.

The only way I can describe it is it sounds like a whirling or winding noise of some sort.

Thank you

Frank Hudon · 05-19-2006, 11:22 PM

the brake pump, hydraulic pressure pump, is on the RH side of the car in a line from the driver seat to the right of the speedo cluster. To find out if it is what is causing the noise stop the car and put it in Park and then step on the brake pedal hard 4 times, is that the noise?

Truffles · 05-20-2006, 05:26 PM

that's it.. thank you. It seems to be cycling on more than before. I'll do some addtional research on the forum.

galaxee · 05-20-2006, 05:32 PM

if it's running that often you need to have it checked out. the system is losing pressure way too quickly if it's running every couple minutes. unless you're talking about heavy stop and go traffic with lots and lots of braking.

edselpdx · 05-21-2006, 10:59 PM

<div class='quotetop'>QUOTE(galaxee @ May 20 2006, 02:32 PM) [snapback]258577[/snapback]</div>

Quote:

if it's running that often you need to have it checked out. the system is losing pressure way too quickly if it's running every couple minutes. unless you're talking about heavy stop and go traffic with lots and lots of braking.
[/b]

Mine has always seemed to run alot. (2005). Almost every time I come to a stop I hear it, and i do mostly city driving with frequent lights. I actually wouldn't worry much unless it seems to interfere with driving or performance.

sj

hobbit · 05-21-2006, 11:29 PM

It's okay if it's running fairly frequently when you're *using*
the brakes, but not when you're not. Try sitting in one place for
a while, in Park. If the accumulator keeps leaking down and causing
the pump to run with no brake usage, then have it checked out.
.
The increase in noise over time may simply be the pump "wearing in".
New accumulator pumps seem to be a bit quieter than ones that have
been on the road for a while, but this doesn't mean the seasoned ones
are shot yet.
.
_H*

**efusco** · 05-22-2006, 09:30 AM

Yup, I'm with Hobbit and others. If you're hearing it that frequently I'd beconcerned about the accumulator running too often. There was a report on PriusOnline a year or so ago where someone had that problem.

Truffles · 05-23-2006, 07:14 PM

Thank you all..

I'll have it looked at soon. If anything exciting is found, I'll let you know.

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05-19-2006, 09:31 PM	#1
Truffles Member Join Date: Dec 2005 Location: Antioch, CA Posts: 54 My Car: 2006 Prius Model: Package: #8 Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	Hello, I have a 2006 with about 7800 miles. There is a noise that I can't seem to identify that seems more pronounced over the last few days. It's coming from behind my dash, right on the other side of my speedometer. It sounds like a pump of some sort is activating. It can happen every couple of minutes and it lasts around 5 seconds. It seems to be more common at slower speeds, but this could be just due to less road noise. The only way I can describe it is it sounds like a whirling or winding noise of some sort. Thank you

05-19-2006, 11:22 PM	#2
Frank Hudon Senior Member Join Date: Jan 2004 Posts: 4,144 My Car: Model: Package: Thanks: 0 Thanked 1 Time in 1 Post Friends: 0	the brake pump, hydraulic pressure pump, is on the RH side of the car in a line from the driver seat to the right of the speedo cluster. To find out if it is what is causing the noise stop the car and put it in Park and then step on the brake pedal hard 4 times, is that the noise?

05-20-2006, 05:26 PM	#3
Truffles Member Join Date: Dec 2005 Location: Antioch, CA Posts: 54 My Car: 2006 Prius Model: Package: #8 Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	that's it.. thank you. It seems to be cycling on more than before. I'll do some addtional research on the forum.

05-20-2006, 05:32 PM	#4
galaxee resident lab rat Join Date: Mar 2005 Location: south of lake Michigan Posts: 9,734 My Car: 2005 Prius Model: N/A Package: #5 Thanks: 0 Thanked 126 Times in 50 Posts Friends: 26	if it's running that often you need to have it checked out. the system is losing pressure way too quickly if it's running every couple minutes. unless you're talking about heavy stop and go traffic with lots and lots of braking.

05-21-2006, 11:29 PM	#6
hobbit Senior Member Join Date: Mar 2005 Location: Bahstahn Posts: 3,775 My Car: 2004 Prius Model: N/A Package: Base Thanks: 0 Thanked 300 Times in 150 Posts Friends: 0	It's okay if it's running fairly frequently when you're using the brakes, but not when you're not. Try sitting in one place for a while, in Park. If the accumulator keeps leaking down and causing the pump to run with no brake usage, then have it checked out. . The increase in noise over time may simply be the pump "wearing in". New accumulator pumps seem to be a bit quieter than ones that have been on the road for a while, but this doesn't mean the seasoned ones are shot yet. . _H*

05-22-2006, 09:30 AM	#7
efusco Troll Slayer Join Date: Nov 2003 Location: Nixa, MO Posts: 17,933 My Car: 2004 Prius Model: Package: #9 Thanks: 89 Thanked 428 Times in 252 Posts Friends: 41	Yup, I'm with Hobbit and others. If you're hearing it that frequently I'd beconcerned about the accumulator running too often. There was a report on PriusOnline a year or so ago where someone had that problem.

05-23-2006, 07:14 PM	#8
Truffles Member Join Date: Dec 2005 Location: Antioch, CA Posts: 54 My Car: 2006 Prius Model: Package: #8 Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	Thank you all.. I'll have it looked at soon. If anything exciting is found, I'll let you know.