Brake Rotor Corrosion !! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-24-2004, 12:18 PM   #1
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Default Brake Rotor Corrosion !!

Since I have a lot of time to play around while my car is up on the jackstands, I decided to do a front brake inspection.
I thought it might be a little overkill on a car with such low mileage but... what the hay.

There was no indication of any problems from an outside view. The face of the rotors are clean and smooth but the backside is another story.

It probably has a lot to do with the humidity living on the West (Wet) Coast.
Worthy of note - I rarely drive it in the salt or even wet roads. The salt is in the air. I think it would be worse if driven as a daily driver in winter conditions.

Because the car hasn't been driven for a month, the rotors were frozen to the calipers. I had to really put force on the tires to spin them free. Where the backside pads had frozen to the rotors, the rotors were covered with rust. Not bad enough for replacement but if I let it go any longer it would have pitted a lot deeper.
I was able to clean them up with a little bit of emery cloth.

Something you guys should be aware of.
If you're going to let the car sit for extended periods, spin the wheels frequently to minimize this type of corrosion.
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Old 01-24-2004, 01:04 PM   #2
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this is commonly due to poor castings. impureities in the metal when they are made. like moisure. i am also an state emission and safty inspection mechanic. chryslers are known for this. i have seem holes pitted through the rear rotor surace. want cross drilled rotors, just buy a chrysler product and wait a year. they do it themselves lol
there is a spay that i use after i resurface rotors or install new ones to a car. it is an anti squeal spray. almost like an alum based spray paint. you spray this on both sides of the rotor and then road test to embed it into the rotor surface.this wards off corrotion like this. and gets rid of any brake squeal. it is expensive, like 17 bux a can, but well worth the cost.
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Old 01-24-2004, 01:16 PM   #3
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Quote:
Originally Posted by jeffrey10x2
this is commonly due to poor castings. impureities in the metal when they are made. like moisure. i am also an state emission and safty inspection mechanic. chryslers are known for this. i have seem holes pitted through the rear rotor surace. want cross drilled rotors, just buy a chrysler product and wait a year. they do it themselves lol
there is a spay that i use after i resurface rotors or install new ones to a car. it is an anti squeal spray. almost like an alum based spray paint. you spray this on both sides of the rotor and then road test to embed it into the rotor surface.this wards off corrotion like this. and gets rid of any brake squeal. it is expensive, like 17 bux a can, but well worth the cost.
Where can you buy this at? The front brakes on my riv squeal so bad that when you're outside the car it hurts your ears.. I plan to paint my front rotors this spring anyway, so that'd be a perfect time to put this spray on it. thanks!
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Old 01-24-2004, 01:32 PM   #4
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NAPA sells it,
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Old 01-24-2004, 04:42 PM   #5
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If you would have just put the car in gear and backed up, the weight would have broke them loose easily. You may have heard a little grunt or something. The first couple times you would have used your brakes, it would have cleaned them up.

To be honest, I have never let my car sit that long. Am I talking out my a$$ on this one?
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Old 01-24-2004, 05:31 PM   #6
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you can drive the car every day and if you have junk rotors, it will do it all the time. what happens is this, when the rotors are cast, if the molten metal has impurities in it, or if it gets moisure in it at all, this will creat a steam pocket inside the rotorlike an air pocket, but in this pocket, there is a little moisture, this is actually eating away at the rotor from the inside out. and since the calipler has more clamping pressure on the inside due to where the piston is at, this area wears thin first and shows the air pockets as rust holes in the rotor.
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Old 01-26-2004, 05:14 PM   #7
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how easy is it to change the rotors to after-market? worth a try for someone technically inclined but hasn't done before (i.e. newbie)?
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Old 01-26-2004, 05:22 PM   #8
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Very easy. Remove the wheel, remove the caliper. Remove the rotor clips, and pull it off. Minimal tools, minimal time.
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Old 01-26-2004, 10:04 PM   #9
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Do you think that buying new rotors may cause my squealing problem to stop? I've already replaced the pads and they still squeal just as bad..
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Old 01-27-2004, 01:29 AM   #10
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Sounds like they could be warped. New rotors will do it but you may be able to get yours turnned down for less $$?
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