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This is a discussion on Squealing when slowing / braking within the Gen II Prius Care, Maintenance and Troubleshooting forums, part of the Gen II (2004-2009) Toyota Prius Forums category; From doing searches on this forum, I understand you can get some squealing while braking from rust build up on ...


Squealing when slowing / braking

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Old 01-07-2009, 06:57 PM   #1
Mormegil
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Default Squealing when slowing / braking

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.

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Old 01-07-2009, 07:51 PM   #2
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Default Re: Squealing when slowing / braking

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 :_>
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Old 01-07-2009, 10:13 PM   #3
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Default Re: Squealing when slowing / braking

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?

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Old 01-08-2009, 02:52 AM   #4
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Default Re: Squealing when slowing / braking

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

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