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Rust Spots on Brake Rotors

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New User

Feb 1, 2008, 5:20 PM

Post #1 of 8 (6839 views)
Rust Spots on Brake Rotors Sign In

I just replaced front brake pads on my 2000 Silverado. The front brakes were making a grinding noise at the end of a stop (not early on when going faster). When I pulled the pads, they weren't anywhere near worn to the metal. I put supposedly good ceramic pads on. I noticed rust spots on both rotors. I didn't have them turned but did sand them down some by hand (as recommended in a shop manual to remove glazing).

The new brakes make the same sound as the old ones. Is the rust causing this? What is causing the rust? I've had the truck for a couple of years, but the sound just started. I visit the coast about once a month - could that be causing the rust? I guess the best thing is to pull them back off and have the rotors turned, right? Any suggestions about cause?

(This post was edited by ronel on Feb 1, 2008, 5:21 PM)

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dave284 profile image

Feb 1, 2008, 5:45 PM

Post #2 of 8 (6830 views)
Re: Rust Spots on Brake Rotors [In reply to] Sign In

Is the vehicle diven daily? Sometimes I let my car set for days and it developes a light coat of rust on the rotors but this is normal. I would advise having the rotors turned at a shop also have the thickness checked. And one more thing if the rotors were glazed it means they over heated the cause of this rear brakes not working or worn and putting all the work on the front brakes,or the front calibers not releasing the rotorsUnsure

New User

Feb 1, 2008, 6:37 PM

Post #3 of 8 (6828 views)
Re: Rust Spots on Brake Rotors [In reply to] Sign In

I didn't notice any "glaze" on the rotors, just the rust. I sanded them per the auto manual, not because of appearance (other than the rust). Would the rust cause the grinding? Should having them turned eliminate it? While in there, I also sanded and greased the clips (or slides) that the pad mount ride on.

The truck isn't driven daily, but never has been. Other than hauling, it's usually used for trips with an older vehicle used in town (daily). I guess the rust could have been there for some time, since this is the first time I've pulled the wheels and looked at the rotors. I would just like to get rid of the grinding noise.

Anonymous Poster

Feb 2, 2008, 12:16 PM

Post #4 of 8 (6822 views)
Re: Rust Spots on Brake Rotors [In reply to] Sign In

its good practice to always "turn" or resurface your rotors with new brake pads. it helps create a good seating surface between the pads and rotor thus increasing brake pad life, decrease pulsation and noise

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Feb 2, 2008, 12:30 PM

Post #5 of 8 (6821 views)
Re: Rust Spots on Brake Rotors [In reply to] Sign In

Also: Clean rotors new or turned as whatever is left will impregnate the pads and can make noise. Many, many rotors just don't allow enough extra metal to shed for turning and the price of even quality new ones isn't always that bad. Watch out for cheap rotors too! I've seen what looks like bits of what was melted down still left to make some of them!!

Long retired now

Anonymous Poster

Feb 3, 2008, 2:31 AM

Post #6 of 8 (6816 views)
Re: Rust Spots on Brake Rotors [In reply to] Sign In

Some new pads are noisy for a while and then quit
after they get broken in. Some pads take 2000+
miles to stop.
Pads like Wagner's Quiet or Raybestos are quiet from the get go. Midas has a quiet brand.
Rust won't cause noise. 1 or 2 stops should get the rust off the rotors.
New rotors can cause noise but it sounds like yours are old, so thats's not it.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Feb 3, 2008, 2:45 AM

Post #7 of 8 (6813 views)
Re: Rust Spots on Brake Rotors [In reply to] Sign In

ronel claimed these were "ceramic" pads. The selling point of these is supposed to be their silence, heat tolerance and long life. A real noise maker is a crack in the lining material which would be much more likely when pads are put on a rotor that hasn't been turned or replaced,

Long retired now

Veteran / Moderator
way2old profile image

Feb 3, 2008, 11:41 AM

Post #8 of 8 (6811 views)
Re: Rust Spots on Brake Rotors [In reply to] Sign In

To go along with Tom's chain of thought--look closer at the rotors and see if you can find any "spider cracks" in the rotor. If so, you will need to replace the rotors.

Being way2old is why I need help from younger minds

Rust Spots on Brake Rotors

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