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Post by TLMOB1 on Jun 8, 2004 22:25:47 GMT -5
Does anyone know where to go on the web to get free downloads of Air Brake Systems and Pre-Trip Illustrations? I've found a few but would like more to choose from. Some sites I can't even print from, it all comes out in a HTML formatt with no page brakes.
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Post by Scott on Jun 9, 2004 8:06:11 GMT -5
Go to www.e-z.net and search for "air brake basics." These are the same pages I use when I teach air brake class. Scott
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Post by TLMOB1 on Jun 9, 2004 21:53:33 GMT -5
Thanks a million!
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Post by maineiac on Jun 10, 2004 23:28:10 GMT -5
thanks scott also wondered if you could clarify correct brake tech for grades ie light steady pressure or light and release? many many thanks
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Post by Fozzy on Jun 11, 2004 5:36:32 GMT -5
thanks scott also wondered if you could clarify correct brake tech for grades ie light steady pressure or light and release? many many thanks This is the BEST site I've found on the subject~ Read it and heed it! LOL www.e-z.net/~ts/ts/downhill.htmI was an "old school" brake dragger from way back. I was taught to drive in the moutains between California and Oregon with doubles and NO JAKES. I was taught to drop into the lowside and drug them all the way to the bottom. Only smoked the brakes badly once in all that. I learned later from a Caterpillar representative (Phil Hook) that he was a driver during the testing and NEVER drags his breaks anymore after the testing of brakes in this research he was involved in. He made me less skeptikal and I gave it a try (nervous as hell BTW). I tried the "snub method" and it does work!!! I've learned to like it and trust it. You will meet people who will NEVER try it and assume that the "old method" is the only safe way. To pass most states CDL tests you WILL have to describe the "snub" method. Fozzy
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Post by Scott on Jun 11, 2004 7:28:48 GMT -5
Like fozzy said, "snub,don't ride." That's the handout I use when teaching downhill.
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Post by maineiac on Jun 11, 2004 10:04:47 GMT -5
when you say snub does this descibe also the stab braking? on hard thenoff or is stab something different? thanks for your patience? am trying and it does me no good to understand what to do if i don't understand why so the extra help i get from all of you is INVALUABLE
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Post by Fozzy on Jun 11, 2004 13:05:42 GMT -5
NO. Stab braking is the procedure you are taught to prevent wheel lock ups in non-ABS equipped vehicles. It consists of getting VERY hard on the brakes and immediately as they begin to lock releasing and getting back on the brakes. Its basically pumping the brakes pretty hard to keep the brakes from locking and causing a skid. The "stab braking" takes practice and us really uneccessary with ABS equipment. Went you want to stop quickly in an ABS equipped vehicle...you simple push and HOLD the brakes hard and the vehicle stops. The ABS system pumps the brakes faster and better than a human can...
GREAT Questions! ;D ;D
Fozzy
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Post by Scott on Jun 12, 2004 8:40:12 GMT -5
Maineiac, Stab braking is used ONLY in an emergency braking situation. As fozzy stated, you get on the brakes HARD, then at the instant they lock, you get off 'em. When they start rolling again you get back on 'em. Snub braking (for downhill) goes like this: When going down a long steep grade let your truck get up to the safe speed,(which might not necessarily be the posted speed), get on the brakes and bring your speed down a GOOD 5 mph below your safe speed. This should only take about 3 seconds. Then get off the brakes. Let your speed come back up to your safe speed and repeat the process. Hope this helps.
Scott
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Post by truckertom on Jun 15, 2004 19:23:09 GMT -5
I learned my braking from my family, and have never really had a problem with snub braking. Heat is the enemy of brakes. When you heat the shoes, it causes brake fade, fade causes a loss of braking effect. This in turn requires more brake pressure it supply the same ammount of brake effect. Before long your brakes are in thermal run-away.
That is when you see the truck on the side of the road or on the escape ramp putting out a brake fire. So how ever you reduce the heat either by less pressure and a lower gear, or by a lower gear and giving the brakes a chance to cool between uses, both have a cooling effect. But if you ask 5 "experts" you many get five ego driven arguments. Talk about thermal run-away!
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