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Removing rust safely from brake drums?


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#1 Megladon

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Posted 08 August 2012 - 12:12 PM

So it recently rained a bit (oddly enough), and my rear brake drums got rust spots. The car is always garaged and that day it happened to not be. The drums are painted the usual black (opaque,flat). Thanks in advance.

#2 TOGWT

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Posted 08 August 2012 - 01:59 PM

Application of the vehicles brake system will remove the rust from the rotors by friction (if it really bothers you replace the existing rotors with zinc rotors (zero rust)
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#3 Ron Ketcham

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Posted 08 August 2012 - 03:42 PM

Rear drums, how old of vehicle?
That rust is normal by the way, unless they have been media blasted after buying the car to remove the factory paint, and a good high temp paint used for calipers is applied.
Grumpy

#4 Boston Man

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Posted 08 August 2012 - 04:55 PM

I sanded them, cleaned, degreased and painted with BBQ paint.

These pics are from 4 years ago. After 2 years, rust started to form at the edges. They havent gotten much worse since then. They are still black.

Im sure they will last much longer if done correctly... What Ron Ketcham said.

Before
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After
Posted Image

#5 Ron Ketcham

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Posted 08 August 2012 - 05:06 PM

It appears they have held up well.
The high temp caliper paint has a more robust resin system than the BBQ paint, and it will last longer, especially when one takes the correct preparations steps as you did.
I have found that three coats, first thin, second medium, allowing some cure/dry time between coats and the last coat as a filler and gloss, produces what appears to work the best.
Grumpy

#6 Boston Man

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Posted 08 August 2012 - 06:34 PM

That AFTER picture is from 4 years ago, as well.

I can take a picture of them if you want, so you can see what they look like now.

#7 Megladon

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Posted 08 August 2012 - 07:09 PM

Application of the vehicles brake system will remove the rust from the rotors by friction (if it really bothers you replace the existing rotors with zinc rotors (zero rust)


It's acually from the rear wheels(FWD car), however zinc rotors are a bit temptive. I wonder how the brake feel/performancw will change.

#8 Ron Ketcham

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Posted 08 August 2012 - 07:16 PM

Let's get things on track.
Are you wanting to know about "drums", "rotors" or "calipers"?
First post was regarding drums, and now you are saying zinc rotors.

Grumpy

#9 Megladon

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Posted 08 August 2012 - 07:28 PM

Rear drums, how old of vehicle?
That rust is normal by the way, unless they have been media blasted after buying the car to remove the factory paint, and a good high temp paint used for calipers is applied.
Grumpy


The car is one year old. Yeah, they ever have been media blasted and repainted.

#10 Megladon

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Posted 08 August 2012 - 07:30 PM

I sanded them, cleaned, degreased and painted with BBQ paint.

These pics are from 4 years ago. After 2 years, rust started to form at the edges. They havent gotten much worse since then. They are still black.

Im sure they will last much longer if done correctly... What Ron Ketcham said.

Before
Posted Image


After
Posted Image


I see, nice job by the way. My drums are no where near as bad as yours were in the first picture.
If they get worse im going to have to do the same.

#11 Megladon

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Posted 08 August 2012 - 07:35 PM

Let's get things on track.
Are you wanting to know about "drums", "rotors" or "calipers"?
First post was regarding drums, and now you are saying zinc rotors.

Grumpy


I'm on track haha.
Just that I was telling TOGWT, that they were in fact the rear drums.

#12 Accumulator

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Posted 09 August 2012 - 12:22 PM

On *MILDLY* rusted rear drums, where the oe finish was still basically OK and there was just a little light rust in some places, I did OK by polishing with KAIO and then with BlackFire's Gloss Enhancing Polish. I topped the BF GEP with BF sealant and it worked out surprisingly well. So well that the BF-stuff approach is how I generally handle mildly compromised matte/satin/flat black bits.

If you wanna redo 'em right, the best "rust treatment" stuff I've found is Rust Bullet's Metal Blast, works a lot better than other Rust Dissolvers/ "Navel Jelly"/etc. Use that stuff and then apply your paint. Or just use it to clean up the rust and then LSP things; I used it on the S8's rear rotor hats (light surface rust breaking through the OE silver paint) and then just KAIO/FK1000Ped them, and it held up fine for nearly a year...OK approach if you don't mind redoing it every now and then.
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#13 RaskyR1

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Posted 09 August 2012 - 12:33 PM

They still make cars with drum brakes? :D

#14 Deep Gloss Auto Salon

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Posted 09 August 2012 - 01:23 PM

They still make cars with drum brakes? :D


I was surprised to find this out as well.

When I was car shopping with my daughter for her 1st "new" car last week I realized many of the the lower trim level vehicles we were looking a had rear drums....the was enough for me to insist we go up a level since I loathe working on drums.
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#15 RaskyR1

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Posted 09 August 2012 - 01:44 PM

I was surprised to find this out as well.

When I was car shopping with my daughter for her 1st "new" car last week I realized many of the the lower trim level vehicles we were looking a had rear drums....the was enough for me to insist we go up a level since I loathe working on drums.



I hear that!

More sarcasm than anything. ;) I knew some of the bare bones models still came with them....I just think it's funny. :D

#16 Megladon

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Posted 09 August 2012 - 02:12 PM

On *MILDLY* rusted rear drums, where the oe finish was still basically OK and there was just a little light rust in some places, I did OK by polishing with KAIO and then with BlackFire's Gloss Enhancing Polish. I topped the BF GEP with BF sealant and it worked out surprisingly well. So well that the BF-stuff approach is how I generally handle mildly compromised matte/satin/flat black bits.

If you wanna redo 'em right, the best "rust treatment" stuff I've found is Rust Bullet's Metal Blast, works a lot better than other Rust Dissolvers/ "Navel Jelly"/etc. Use that stuff and then apply your paint. Or just use it to clean up the rust and then LSP things; I used it on the S8's rear rotor hats (light surface rust breaking through the OE silver paint) and then just KAIO/FK1000Ped them, and it held up fine for nearly a year...OK approach if you don't mind redoing it every now and then.


It's really light rust to consider repainting them. That's what i'll do, KAIO and BF GEP which I happen to have. However; I ran out of FK1000P a while ago. An excuse to order another can, and they last forever. Only reason I ran out, I use it on all our boat and jetskiis in AZ. I have some wheel wax but I don't think that's the better option.

I wouldn't mind redoing them now and then. Thanks

#17 Megladon

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Posted 09 August 2012 - 02:21 PM

@Rasky: haha yeah they do.

@Gloss: this particular car has the top trim level too haha. I don't mind drums however.

#18 silk

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Posted 09 August 2012 - 02:24 PM

I wonder if after painting-- you put OC on it?, might help.... I am having rust on mine, thinking about that route.

#19 Megladon

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Posted 09 August 2012 - 03:57 PM

I wonder if after painting-- you put OC on it?, might help.... I am having rust on mine, thinking about that route.


Might help, I never tested OC on wheels. I wonder how the heat resistance is.

#20 Ron Ketcham

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Posted 09 August 2012 - 04:10 PM

NOPE, not long enough to spend the time and effort to do so.
Hey, let drums alone, I won a lot of road races with drums on the front and back.
Kids, what do you know?
Yeah, disc are much better, but for driving an econo car around town, not needed.
Grumpy




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