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What do you guys paint new cast iron drums with?
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I use black semi gloss rattle can rustoleum -
Good deal, I will get a few cans tomorrow. Thanks, I was hoping not to get out the spray gun and mix up some expensive stuff.Comment
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If you live in a mountainous terrain or are an aggressive driver then braking can get the drums pretty hot. Some paints will blister. You may want to use hi-temp black barbecue or stove paint. Last set of brakes I did started with a wash of Ospho over the fresh metal followed by Rustoleum 'High Heat' paint.Comment
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I have also used black brake caliper paint. Bad part is it takes forever and a day to dry. RodMuch of the social history of the Western world, over the past three decades, has been a history of replacing what worked with what sounded good.Comment
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I use the Rustoleum high temp black. Before I spray them I clean them with acetone and let dry for about fifteen minutes and then spray on thin coat. Just enough to cover them and they will last a long time.Comment
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Painting brake drums reduces the drums ability to dissipate heat...Comment
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Actually this is not exactly true on two levels.Originally posted by CM2 View Post
First, as Bill mentioned, rust. Aside from ugly the rust is porous and full of trapped air, making it an effective thermal blanket.
The paint will provide slower thermal transmission than metal so a thin coat is recommended, as it has little insulating value. If you put gobs, layers and layers on then, of course, you will see some reduction in energy transfer, but still likely less than you will get through red rust.
Second, if you use black paint it will both absorb and radiate thermal energy differently than a reflective machined new drum. Here's what happens (warning- physics geek at keyboard!):
When photons strike a surface they either are reflected or absorbed. Everyone pretty much understands that a black surface will absorb heat faster than a reflective one. Infrared photons are very good at knocking electrons to a higher energy state.
OK, that is the opposite of brake drums- they are already hot and need to dissipate heat. Substances that easily send electrons to higher energy states when they absorb energy are also better at EMITTING infrared photons when the material drops electrons to a lower energy state (cools off). Shiny reflective metal, as well as white paint, do a much poorer job of losing heat by emitting photons than black substances. Ever wonder why all engine radiators are painted black? Try white and see if it cools as well.
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Given the porosity of rust and its roughened surface basically expanding the area needing to be cooled Id say rust is a better cooling media than the smooth paint job....millions of truck and car drums cant be wrong..given the braking dynamics in a model A I'll surrender at this point,odds are if the drums get hot enough to burn off the paint that's the least of your worries.. -
On my scooter, when passing by a BLACK Van, very little reflected HEAT. When passing by a WHITE Van, WAY MORE reflected heat.
Dad Sweating
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Just replaced my front drums and had them powder painted red to match the rear drums and wheels. Original powder paint was applied in 1998 and except for some chips on the radius rods, everything looks like new.Comment
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Most of the factory photos show gloss enamel on the drums, etc. We have rocky mountain fronts and standard rears that perform well with the rattle can enamel. We also found that the $1 variety gloss black cheapo from Home Depot gives just enough coverage, and the flat back same stuff is fine for radiators. They are thin enough to allow for touch up without heavy build up.Comment
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When were reproduction cast iron drums introduced? The key word being reproduction. I have some cast iron drums on my A but they are not as well machined as those currently available from vendors. Decades ago it was the late 31's from Ford that were highly sought after. I'm assuming because nothing else was available. I'm trying to date the drums I have. Here's pictures of a current drum and...04-02-2018, 04:50 PM -
I have an ammco 4000 brake lathe,
resurfacing / truing the front drums is no problem as the 1" arbor and standard race adapters work beautiful. The issue is the rear drums as the 1" arbor will not slide through the end of the hub because it has a 3/4" opening. After doing a little research i found that ammco sells an 11/16th" arbor which comes with all needed accy's. This...07-06-2017, 07:54 AM -
I have been helping a club member with a brake problem on his 30 Coupe. When we got around to miking the brake drums, we were shocked on how thin they were. All the drum were steel(not cast iron). The front miked out around .105" and the rears were both about .060". The low end of the spec is .120". I don't know how he was able to get his coupe to stop at all. VERY UNSAFE. We are now...11-02-2018, 07:24 PM -
I have a couple of questions for the more knowledgeable members. What kind of equalizers do I have and what type of brake liner is best with the late 31 cast iron drums. I have used the Scandinavian lining on steel drums and I have them to use with new cast iron drums on a project but they aren't on the chassis yet. Bratton's has the woven lining, Mikes has the molded type and Snyders has both and...03-07-2018, 08:55 PM -
Correct me if I'm wrong, but the spacers recommended for putting 16" wires on Model A drums are not necessary when using 39-48 drums. Switching to steel wheels and can't see why I need them. Thoughts??02-22-2018, 05:48 PM -
I have visited this topic before about having 2 different brake drums on the front of my car. Someone said this brake drum came off a late model 1931 Model A, I have searched every resource I have to substantiate this but alas I can find no pictures or reference to it. I am having a EXTREME brake chatter, mostly noticeable the first few times I step on the brakes after the car has been sitting,...09-15-2018, 07:26 AM -
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I ran onto this a while back and bought one for measuring brake drums. Was tired of using a ball bearing and my micrometer (the Ron Cloat method). Although it is not a high end tool it does the job and is accurate. Rod
http://m.ebay.com/itm/Anytime-Tools-...%257Ciid%253A108-10-2017, 09:38 PM -
I have swapped out my old steel drums for new cast iron drums. The shoes have been re-lined. I’ve gone through the moving parts and re-ground the brake adjusting shafts to match the lengths of the pairs. Now putting things back together. I’ve fully backed out the adjusting wedge, but find that the new drums are binding on the new linings.
Pulling the shoes off again and placing them inside...09-09-2018, 07:20 AM
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