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post #1 of 3 (permalink) Old 06-10-2013, 12:00 PM Thread Starter
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Default Scraping sound from passenger rear wheel

Hi all,

My 2010 Prius has developed a strange metallic scraping sound on the passenger side rear wheel. The sound is cyclic and changes with the speed of the car. I am uncertain when the sound started since it is not very loud, so I may have missed it in the past (I can barely hear it with the windows up). The sound starts up after I drive the car around for a while.

I took the car to my dealer this morning and he replaced the wheel bearings. However, after I drove off the dealers lot, I heard the sound again! I went back to him and he said that the sound is just a little bit of rust on the rotor and will go away if I drive the car around for a while. Also, I feel no difference in the response of the car while braking.

Can a little bit of rust on the rotor cause a scraping sound?

Thanks for your help!

JC

Last edited by John C; 06-10-2013 at 12:02 PM.
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post #2 of 3 (permalink) Old 06-10-2013, 02:00 PM
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There is a recall that just came out on the Brakes on the 2010 Prius and Lexus. Go to the Dealer and demand the Recall fix.

Earl D
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post #3 of 3 (permalink) Old 06-29-2013, 06:25 AM
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Not sure where you live. However, if you parked your car for several days without driving it, and you drove through rain or it's been very humid, it probably is rust on the brake rotors (or drums, if so equipped).

Before visiting the dealer again, suggest you try the following:

To remove rust coating from brake parts, find a street or road with no traffic on it and do 3-4 panic stops, just short of locking up the wheels and activating the anti-lock braking system. This will heat up the rotors and pads, and scrape off the rust.

Prius's use regenerative braking, and if you don't occasionally stop hard enough to actually engage the brake rotors and pads, rust will build up on them (weather and/or driving conditions permitting). Then, when the rust gets thick enough, you'll hear scraping sounds when driving, and brake squeal when stopping hard.

After you have confirmed that this fixes the problem, I'd just ignore the scraping noises; or just occasionally brake a little harder than usual.

Note: Consistently braking hard will significantly reduce your fuel economy.

Last edited by Phoenix; 06-29-2013 at 06:30 AM.
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