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Tool Talk Discussion Forum

air brakes

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EIL

02-12-2004 21:41:30




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Hello fellas!!!! In about three or four months I will probably get a job for the municipal trash pit working as a mechanic and they have a LOT of truck brake downs so I need to learn air brakes. I already took the class at school in the diesel mechanic cource but I didn't learn much. About the only thing I learned is how to remove all the brake components off of an axle, replace brake pads, adjust brakes, disable parking brakes, and the well known rule to never disasemble brake chambers until I know how. So does anyone know a web site that has an explanation of how air brakes work. I do remember from the class that their are a ton of valves. I remember a little like the compressor, governor, air tanks, and such but I don't remember all the valves and what each valves purpose is. Also, it would be nice to learn how to troubleshoot air brakes. Thanks for any help!!!!!

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db

02-13-2004 17:48:39




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 Re: air brakes in reply to EIL, 02-12-2004 21:41:30  
Buy a shop manual on Ebay. I just got one for a 1973 medium duty Chevy for $5.00 plus shipping. That one covers air brakes. Also get one for a heavy duty truck.



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DaveCA

02-13-2004 17:14:05




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 Re: air brakes in reply to EIL, 02-12-2004 21:41:30  
try this link. theyn have lots of info if you look around.



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Pollack Pete

02-13-2004 15:59:31




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 Re: air brakes in reply to EIL, 02-12-2004 21:41:30  
Check this site out.They're working on bus air brakes,but the principles are the same.
http://www.busnut.com/artgm06.html



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chris`

02-13-2004 14:44:50




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 Re: air brakes in reply to EIL, 02-12-2004 21:41:30  
I have always wondered, how do you disengage the parking brake if there is no air??? I know they uses springs to activate the parking brakes. Could you explain that for me???

Thanks!! Chris



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Greywolf

02-14-2004 04:47:45




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 Re: Re: air brakes in reply to chris`, 02-13-2004 14:44:50  
Never seen anyone cage a spring just because of a "no air".

Just grab the 9/16 wrench, hammer, and loosen up the slack adjusters. Lots safer and quicker.



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EIL

02-13-2004 19:46:14




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 Re: Re: air brakes in reply to chris`, 02-13-2004 14:44:50  
There is a bolt on the side of the brake chamber that has a specially designed head and on the other end a nut and washer. Just remove the nut and washer and stick the head of the bolt into the hole in the end of the chamber and twist the bolt until you feel it slip into the notch, then put the nut and washer on the bolt and tighten it with a wrench until it stops. This will disable the spring brake for the parking brakes.

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raytasch

02-13-2004 18:11:16




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 Re: Re: air brakes in reply to chris`, 02-13-2004 14:44:50  
Don't go there if you don't understand the dangers of working on around those cans. You use an auxillary air source or place a wrench in the pop out plug in the can and compress the spring.
Not something to be worked on if you don't understand.
ray



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Stick

02-13-2004 09:28:03




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 Re: air brakes in reply to EIL, 02-12-2004 21:41:30  
For an explanation of the various valves in the system and what they do, get a study guide from your local driver's licensing department for truck drivers air brake endorsement. That won't give you detailed service procedures, but it will give you the general idea of what everything is for.



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TO35

02-13-2004 02:59:04




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 Re: air brakes in reply to EIL, 02-12-2004 21:41:30  
EIL....try doing a google search usuing words like ,Air brakes,bendix or maybe try the manafactures web sites . They are usually really good about litature on brakes. I have lots of manuals that have info. on the subject. Don't forget to ask your teacher for more inf. too


hope this helps you some...and good luck with your job..

TO35



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stihltech

02-15-2004 18:13:41




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 Re: Re: air brakes in reply to TO35, 02-13-2004 02:59:04  
Many air brake suppliers with furnish you with all the info you need to properly repair and understand air brake systems. Sometimes a good teacher is the guy who is working on them now at the shop.
If possible, I never disconnect the air supply to the spring brake side of the chamber until it is removed from the bracket of the vehicle. If no air is a problem, you will have to cage the spring with the T bolt as explained to remove, but NOT TO OPERATE THE VEHICLE!

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