strange buzzing in steering column

Loaftx · 08-29-2007, 08:11 PM

I have a 2007 package 5 with under 2000 miles. Occasionally, and perhaps more frequently of late but not always, when I put my foot on the brake, there is a strange buzzing in the stearing column for about a second or so. Has anyone heard of this? Should I take it in?

I don't remember this with the cars I test drove.

Also, there sometimes seems to be a buzzing in the engine area when I turn off the car.

Both seems to be electrical but I really do't know.

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qbee42 · 08-29-2007, 09:16 PM

The buzzing with the brake is the brake accumulator pump. The Prius can't use normal vacuum assist for power brakes, so it uses a little pump. It runs about every third time you press on the brake peddle.

The pump sound when you shut down is a coolant transfer pump that save hot engine coolant in a thermos bottle for later use. This helps you start with a warm engine the next time you start.

It's all normal. Don't worry.

Tom

dogfriend · 08-29-2007, 11:36 PM

Normal

and

Normal.

Loaftx · 08-30-2007, 09:11 AM

Thank y'all for explaining that, it save me some worry and a trip to the dealer.

08-29-2007, 08:11 PM	#1
Loaftx Junior Member Join Date: Jul 2007 Posts: 7 My Car: Model: Package: Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	I have a 2007 package 5 with under 2000 miles. Occasionally, and perhaps more frequently of late but not always, when I put my foot on the brake, there is a strange buzzing in the stearing column for about a second or so. Has anyone heard of this? Should I take it in? I don't remember this with the cars I test drove. Also, there sometimes seems to be a buzzing in the engine area when I turn off the car. Both seems to be electrical but I really do't know. java script:emoticon('',%20'smid_11')

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08-29-2007, 09:16 PM	#2
qbee42 Senior Member Join Date: Mar 2006 Location: Northern Michigan Posts: 12,300 My Car: 2006 Prius Model: Package: #7 Thanks: 363 Thanked 834 Times in 607 Posts Friends: 14	The buzzing with the brake is the brake accumulator pump. The Prius can't use normal vacuum assist for power brakes, so it uses a little pump. It runs about every third time you press on the brake peddle. The pump sound when you shut down is a coolant transfer pump that save hot engine coolant in a thermos bottle for later use. This helps you start with a warm engine the next time you start. It's all normal. Don't worry. Tom

08-29-2007, 11:36 PM	#3
dogfriend Human - Animal Hybrid Join Date: Feb 2007 Location: Carmichael, CA Posts: 6,152 My Car: 2007 Prius Model: Package: #6 Thanks: 832 Thanked 382 Times in 305 Posts Friends: 11	Normal and Normal.

08-30-2007, 09:11 AM	#4
Loaftx Junior Member Join Date: Jul 2007 Posts: 7 My Car: Model: Package: Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	Thank y'all for explaining that, it save me some worry and a trip to the dealer.