Whirring noise while braking??

BethlehemPrius · 07-12-2007, 03:57 PM

Ok I think I know the answer to this question, but asking it anyways.

I don't recall hearing this noise before, only lately, so not sure if you don't hear it when it is new or if their is something wrong with the car.... Anyways, when braking sounds like something is making a whirring sound, which I am assuming is the regenerative braking system, odd part is that I don't ever recall hearing it before, just turned 8k on my car last week so I know she is now broken in. I don't think it sounds like the brakes are bad or anything so I am assuming that has to be what I am hearing....

Any confirmations out there for me? Has anyone else noticed this later in the cars life but not right away..?

Thanks :-)

Rae Vynn · 07-12-2007, 03:59 PM

Mine has a high-pitched note, which is somewhere between a whistle and a hum... very quiet, only hear it when I have the stereo off. I assume that it is a normal sound for the car.

qbee42 · 07-12-2007, 04:01 PM

The regenerative braking makes a whirring sound like that on a subway, when the traction motors are running. There is also another noise when braking, which is the brake accumulator pump. The accumulator pump runs about every third time you press the brake, and makes a kind of clicking or clattering sound down near your feet. Do you hear your noise every time?

Tom

BethlehemPrius · 07-12-2007, 06:03 PM

Thanks for the confirmation, figured as much, but wanted to check with the crowd.

thx!

richard schumacher · 07-12-2007, 11:05 PM

Don't feel bad. Some people go for months without noticing the flashing car key icon on the dash when the car is OFF; and then one day they do notice it, and panic :_>

07-12-2007, 03:57 PM	#1
BethlehemPrius Join Date: Jan 2007 Location: Bethlehem, PA Posts: 174 My Car: Package: Nominated 1 Time in 1 Post TOTM Awards: 0 Friends: 0	Ok I think I know the answer to this question, but asking it anyways. I don't recall hearing this noise before, only lately, so not sure if you don't hear it when it is new or if their is something wrong with the car.... Anyways, when braking sounds like something is making a whirring sound, which I am assuming is the regenerative braking system, odd part is that I don't ever recall hearing it before, just turned 8k on my car last week so I know she is now broken in. I don't think it sounds like the brakes are bad or anything so I am assuming that has to be what I am hearing.... Any confirmations out there for me? Has anyone else noticed this later in the cars life but not right away..? Thanks :-) __________________ Prius

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07-12-2007, 03:59 PM	#2
Rae Vynn Resident Witch Join Date: May 2007 Location: Grays Harbor, WA, USA Posts: 2,799 My Car: 2007 Prius Package: Base Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 52	Mine has a high-pitched note, which is somewhere between a whistle and a hum... very quiet, only hear it when I have the stereo off. I assume that it is a normal sound for the car.

07-12-2007, 04:01 PM	#3
qbee42 Senior Member Join Date: Mar 2006 Location: Northern Michigan Posts: 5,643 My Car: 2006 Prius Package: #7 Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 6	The regenerative braking makes a whirring sound like that on a subway, when the traction motors are running. There is also another noise when braking, which is the brake accumulator pump. The accumulator pump runs about every third time you press the brake, and makes a kind of clicking or clattering sound down near your feet. Do you hear your noise every time? Tom

07-12-2007, 06:03 PM	#4
BethlehemPrius Join Date: Jan 2007 Location: Bethlehem, PA Posts: 174 My Car: Package: Nominated 1 Time in 1 Post TOTM Awards: 0 Friends: 0	Thanks for the confirmation, figured as much, but wanted to check with the crowd. thx!

07-12-2007, 11:05 PM	#5
richard schumacher nacreous lacquer Join Date: Mar 2004 Location: United States Posts: 4,126 My Car: 2004 Prius Package: #6 Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	Don't feel bad. Some people go for months without noticing the flashing car key icon on the dash when the car is OFF; and then one day they do notice it, and panic :_>