Squealing when slowing / braking

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Mormegil, Jan 7, 2009.

  1. Mormegil

    Mormegil Member

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    From doing searches on this forum, I understand you can get some squealing while braking from rust build up on the drums (or maybe discs).

    I noticed a squealing noise when braking slowly, while way over 7-8 mph. At that point, it's typically the regenerative braking, and not the conventional friction brakes.

    Is it possible the rust could be causing squealing under such circumstances?

    I've got a 2007 with about 19,000 miles on it and my wife tells me I drive like a granny - so I doubt it's premature brake pad wear.

    Thanks
     
  2. richard schumacher

    richard schumacher shortbus driver

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    A faint, high pitched whine, faint enough that you may not be certain it's there, is the normal inverter noise.

    Does it disappear at low speed, or get louder/worse? I assume that you know or can guess what it sounds like when a rock is stuck in the brakes :_>
     
  3. qbee42

    qbee42 My other car is a boat

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    If it's not the normal regenerative whine, then you could have rust, a stone, or a mis-adjusted rear drum. Have you tried shifting into N and then braking? That will take regeneration out of the question. You can also use that technique to clean the brakes. Find a clear stretch of road, take it up to 40 or so, shift into N, and then brake until you slow down to 10 or 20. Repeat that a few times and see if the noise goes away.

    The rear drums are self adjusting, but it is possible for the adjustment to get messed up. Have you suffered a reduction in fuel mileage?

    Tom
     
  4. Mormegil

    Mormegil Member

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    I'll give that a try tommorow (the neutral braking).

    Thanks
     
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