Scoring on brake discs/rotors.

If it's just your rear wheels, that could be your parking brakes.

 

BAD advice, based only on that picture.
NO....no warranty possible on brake wear in general.
The real bottom line is:
I think based on all that he SAID, that his rotors are perfectly normal.
Most ALL will be shiny and many will show uneven groves due to uneven pads.
Uneven groves is QUITE different than SCORING.

 

really? it seems you're the only one

 

Vehicle currently has 28,000 miles. I believe something got stuck like debris on both rear rotors causing the uneven wear. It's not bad but visible and uneven enough to feel it as you run your finger on the rotor surface.
I can take a picture and post it. My solution at the moment is just wait until the pads are worn out to get new ones and get the rotors then resurfaced.

 

No one's done a rear brake job though? That can screw them up; don't ask me how I know...

 

A fault with the ABS unit could be something that could cause all 4 brakes to be affected.

 

that might be the friction brakes kicking in around 6-7mph?

without having other prius experience, its hard to know what's normal and what isn't

 

that doesn't sound normal, but may be due to the state of the rotors. or perhaps something defective in the calipers?

 

Can you perhaps get it on video of the noise to get an idea. I'd recommend using compressed air and brake cleaner to remove any debris from all four brakes and apply a light coat of brake lubricant on the parts that move.

 

Of those who have commented maybe.
But that does not necessarily make it wrong.

More information is needed.
Wild guesses usually aren't really helpful.
Yes, really.

 

That does NOT by itself indicate a problem.
Many/most/all disc rotors will display some rippling of the surface as they wear.
That is because of an uneven composition of the pads.
In general, the better the pads, the less rippling.

 

You are just FULL of bad advice on this subject.

If you have a light enough touch with your foot, you can make the disc brakes on almost ANY vehicle squeal or chatter slightly when just barely moving.

 

That doesn't sound normal to me, it may be that the pads are glazed too.

 

Mine had no ripples or grooves at 300K miles on my gen II prius. I just replaced the original pads, front rotors and rear drums.

 

I'm seeing/hearing it ok now, and that sounds fishy. Maybe mechanic from the dealership can test drive?

 

of COURSE you didn't have such dynamics. Anyone with relatively moderate breaking skills can keep Prius rotors/pads for an easy 6-figure amount of miles. But there's no point in giving experiential advice really - after post #42 - as there will always be somebody here that will countermand 38yrs experience in the electro/mechanical aerospace field, w/out so much as a fraction of a basis why they would make such irrational notions.
Rotors with visible grooving as in the pic above - means that they are likely as deep as .015" which in some states, by law you have to either resurface or junk 'em. There are lateral irregularity regulations as well in many areas. The batch of metal (alloy) may be flawed, or incorrectly heat-treated. That may be why on the other thread, Toyota was quick to do a replacement on another's Prius regardless of warranty.
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