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Re: Questions about AIR BRAKES ???
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Posted by the tractor vet on January 12, 2006 at 06:22:49 from (4.124.72.205):
In Reply to: Re: Questions about AIR BRAKES ??? posted by Allan in NE on January 12, 2006 at 04:29:21:
Since i first parked my donkey in a big truck back in 63 alot has changed with the air brake system and the first truck was a 57 B61 Mack that was a 6 Cyl. gas with a 5 and a 4 speed trans it had no spring parking brake system just the big old drum on the drive shaft and the hand parking brake that was just about useless and if you lost air pressure you had NO BRAKES now to day on your air brake system you have a piggy back system one side is a vary heavy spring and it requires air pressure to release the brakes and the other side of the chamber applys the brakes with air pressure so if your air pressure drops below about 60-65 lbs then the spring brakes come on automaticly and should LOCK the brakes up , your foot valve works like the reg on a tourch set and regulates the amount of air that you manualy apply with your big old foot and usualy it take around 20- 40 LBS of applyed air pressure for a normal stop , depending on the size of the truck and the size of the brake the brake chambers range from the small one on the steering axel of 4 inches on up to 8 inches on the heavy duty steering axel from 6 inches to 9 inches on the driver and trailers. And the sizes on the drum brakes come in all sizes . The one Dump trailer that i had had 14 inch wide brakes on it better knowen as mountain brakes but any brake will fade with heat even a disc but not as fast as a drum .
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