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Troublesome Brake Question.
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Guest
Anonymous Poster
emmixtapes@yahoo.com
Sep 28, 2007, 12:26 AM
Post #1 of 4
(1213 views)
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Troublesome Brake Question.
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 Ok so, my instructor at Lincoln Tech (DADC),
popped this question and assured 20pts to the final grade of the 1st person to get it right.
The question was: What kind of gas do brakes give off during/after the braking period?
Ive scoured my text books, countless internet pages etc. Only to find that this gas is very suprisingly referred to as just that, "gas".
Does anybody know WHAT this "gas" is? Or, where i might find more info defining this "gas"?
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Sep 28, 2007, 4:11 AM
Post #2 of 4
(1209 views)
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Re: Troublesome Brake Question.
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HOT AIR! (And particulates of materials used) Now you could look up the composition of air. Oxygen%, C2O%,Nitrogen% etc.
This question is incomplete. The only thing common to almost all brakes is the use of a steel product. The friction material that was commonly used was asbestos does give off a smell of sulfur like gas. Trouble with that is asbestos is near banned for use in friction material now. It is where I live in the "People's Republic of Massachusetts" and products are clearly marked "asbestos free."
Now if you research "steel" you will find it starts as Iron Ore and through foundaries becomes iron which then can be altered in grades and different types. A few: Cast Iron, Steel, Hardened Steel, Stainless Steel, High Carbon Steel, and lots more.
I don't know your instructor or the intensity of the class but I suspect this is a trick question. I have heard and been told that the temp at point of contact can reach 3,000 degrees F. in brakes. That may be part of the trick as metals at that temp would give off a gas of various types depending on the metal used.
Friction material: I've seen, asbestos, porcelain, semi-metalic, metalic, more? What percent of what metal is used? It's not listed on packaging anyway. If not now we'll see more plastics. Crude brakes in various applications use rubber! Now that could go off on another tangent. The only real braking action for a vehicle is the friction between its tire and the road. Both of those vary too. I'm digging too deep for the trick here I'm sure.
You've captured my attention with this and I want to know what answer you come up with and what the instructor comes up with. I gotta know that answer!
My cat was of no help!
T
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Guest
Anonymous Poster
Sep 28, 2007, 2:23 PM
Post #3 of 4
(1204 views)
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Re: Troublesome Brake Question.
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You know, I myself am starting to think that this IS a trick question. Since the banning of Asbestos products here in the US in the late 1970's, all we are left with is composite/organic, semi-metallic, fully metallic, ceramic, and even carbon fiber for higer grade brake pad applications. (Not to say that you can't cross the canada/mexico boarder and still buy asbestos containing products...in fact i hear that Asbestos is one of canadas top 10 products)
But as for Non-Asbestos products here in the US, I've been reading up on a process in which they "cook" persay, the brake pads during manufacurting. The goal in which is to reduce "gas", if not almost entirly make gasses non present (hmm, slotted, dimpled, drilled rotors becoming useless, beside maybey better wet weater braking i.e. prevent hydoplane at the rotors??). Off course theres other goals in mind such as higher COF, slower wear etc etc.
So, if they are starting, or have been making pads with little to no "gas" during braking, something else has to replace the gas due to "conservation of matter". So the best thing that I can come up with, is a rather fine dust. Not a gas, but a dust. But then I also wonder how sumthing can get THAT hot and not produce some kind of vapor i.e "gas".
To tell you the truth I am VERY confused about this, and i dont think ill be getting that 20pts tacked onto my final grade haha. HOWEVER, my class ends next week. So, I'll be sure to pry the answer (if there is one) out of him.
(you know now that i think about it, its prolly a trick question devised to make us read our damn text books. And if so, it sure as hell worked!!!)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Sep 28, 2007, 3:54 PM
Post #4 of 4
(1202 views)
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Re: Troublesome Brake Question.
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I still want that answer. If you think this is really pointing to a "gas" then I would pick sulfer. Think! High carbon steel has the carbon (coal) and high sulfer coal is a problem with air pollution and also makes acid rain downwind of the monster plants that use it. Now controlled though.
Still kind of think this is a trick because there is no material that absolutely all brakes use.
If you win - kitty likes Fancy Feast!
T
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