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Old 06-08-2010, 03:24 PM   #1
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Re: Air Brake Questions

Go to your DMV and pick up a commercial driver handbook and study the air brake section. With air brakes, you have to understand the system or you might end up without brakes.

CA Commercial handbook
http://www.dmv.ca.gov/pubs/cdl_htm/toc.htm
Air Brake Section
http://www.dmv.ca.gov/pubs/cdl_htm/sec5.htm#sec5
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Old 06-08-2010, 05:00 PM   #2
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Re: Air Brake Questions

Quote:
Originally Posted by cincinnati_kid
Quote:
Originally Posted by crazycal
Go to your DMV and pick up a commercial driver handbook and study the air brake section. With air brakes, you have to understand the system or you might end up without brakes.
At least he wont hurt anyone when the brakes go out


I don't get it.
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Old 06-08-2010, 06:34 PM   #3
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Re: Air Brake Questions

Quote:
Originally Posted by crazycal
Quote:
Originally Posted by cincinnati_kid
Quote:
Originally Posted by crazycal
Go to your DMV and pick up a commercial driver handbook and study the air brake section. With air brakes, you have to understand the system or you might end up without brakes.
At least he wont hurt anyone when the brakes go out


I don't get it.
Air brakes have a spring assembly that engages when the air pressure is too low. Thus, the bus will not move if the air system fails or leaks. So when CK said "At least he wont hurt anyone when the brakes go out", that statement is true.
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Old 06-08-2010, 06:37 PM   #4
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Re: Air Brake Questions

I think there is more to air brakes than whether or not you have air but yes, if you have no air, you're not going very far.
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Old 06-08-2010, 08:16 PM   #5
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Re: Air Brake Questions

They are going to "feel" different, but the only way to get used to the lack of a solid connection between your foot and the drums or the delay in their action is to drive them. You'll also be surprised at their power.
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Old 06-08-2010, 08:21 PM   #6
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Re: Air Brake Questions

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Originally Posted by crazycal
I think there is more to air brakes than whether or not you have air but yes, if you have no air, you're not going very far.
I was trying to simplify the answer. Perhaps I made it too simple. CC you are right. Air Brakes are a complex system. However, in keeping the system immobilized, the answer is simple......
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Old 06-08-2010, 10:08 PM   #7
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Re: Air Brake Questions

One example is not bleeding your brakes and if you live where it freezes, you now have to worry about that moisture freezing in your lines. I am not pretending to be an expert, but it's not just a go, no-go type of thing.
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Old 06-08-2010, 10:45 PM   #8
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Re: Air Brake Questions

Best to know about slack adjusters and how to adjust (if you don't have the automatic ones.) If the throw on them are past tolerance even your spring brakes won't stop you.
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Old 06-09-2010, 07:26 AM   #9
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Re: Air Brake Questions

Quote:
Originally Posted by bus-bro
Best to know about slack adjusters and how to adjust (if you don't have the automatic ones.) If the throw on them are past tolerance even your spring brakes won't stop you.
Very valid point. The mechanical slack adjusters are easy to adjust. Simply adjust the adjuster to a firm (not tight) contact between pad and drum, then back off 1/4 turn. Also, CC, in cold climates use rubbing alcohol to free up the frozen lines. Alcohol dries up the water and frees up the internal workings of the brakes.

There are air driers that can be grafted into the system to help eliminate water issues.
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Old 06-09-2010, 08:54 AM   #10
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Re: Air Brake Questions

Quote:
Originally Posted by M1031
Quote:
Originally Posted by bus-bro
Best to know about slack adjusters and how to adjust (if you don't have the automatic ones.) If the throw on them are past tolerance even your spring brakes won't stop you.
Very valid point. The mechanical slack adjusters are easy to adjust. Simply adjust the adjuster to a firm (not tight) contact between pad and drum, then back off 1/4 turn. Also, CC, in cold climates use rubbing alcohol to free up the frozen lines. Alcohol dries up the water and frees up the internal workings of the brakes.

There are air driers that can be grafted into the system to help eliminate water issues.

I don't live where it freezes, but I know about alcohol. It's not me that is looking for the education, the OP is. All I did was post links to the CA commercial driver handbook and the air brake section. If CK thinks ignorance of air brake systems is no big deal, it's no skin off my back.
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