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07 Prius Break Noise

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Posted by xlntmike on December 9, 2006, 4:35 pm

I just bought an 07 Prius and didnt notice any odd noise until about 1000
miles.  The noise I am noticing is what sounds like a break pump or
equivilant coming from the engine compartment.  At a stop or shortly after
almost every stop this sound kicks in for about 3 seconds.  I took it to a
Toyota dealer and the tech said it was normal.  Does anyone else have this
I am trying to recall if I just didnt hear it the first 1000 miles due to
getting use to all of the features that this car has.  Also I may have had
the radio on a bit louder in the begining too.

Posted by Bill on December 10, 2006, 4:42 am

xlntmike wrote:

What is a break pump? I do my own maintenance on my Prius and have never
heard of this thing.

Posted by Michelle Steiner on December 10, 2006, 5:01 am

I think he means brake, not break.

Support the troops:  Bring them home ASAP.

Posted by xlntmike on December 10, 2006, 3:37 pm

I am sorry, I did mean brake, not break.  When I press the brake peddle is
when I hear this pump sound.  is that normal?

Posted by on December 11, 2006, 1:28 pm

The car is quieter in warmer times than colder times but still quieter
overall.  I'm sure you can hear the engine more now that the climate has
turned cold. I sometimes hear what sounds like a mechanical soft sounding
whine (as if a door was closing under the hood) and just chaulk it up to the
computer adjusting some sort of linkage. The only time I hear what you
describe as a pump sound is when I've started the car and threw in into gear
way too fast.  There's a slight shuddering and then again when I stop. It
may have something to do with the computer thinking the engine didn't fire
correctly at start up.
It could be something normal but hard to explain so they just tell you it's
OK, it's normal. Don't lose any sleep over it. You're covered :)
I'm having a slight problem with the front driver side tire "singing" at
high speed since having a rotation. The front end is pulling to the left a
bit and the mechanic said it's called bias pull, from not rotating the tires
soon enough. According to their records, yeah, it's been awhile but in fact
they have been rotated but by my other mechanic. Supposedly it'll work
itself out. They offered to swop the left and right front tires. Up to now
the car tracked in my opinion perfectly.


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