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Old 02-12-2016, 09:43 AM   #43
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Apparently you have been doing it wrong?

When descending a grade "SNUB Braking", (as described in an earlier post), will HELP PREVENT the service brakes from overheating...
Whereas "holding a steady 5#'s of pedal pressure (basically resting your foot on the pedal)" when descending a grade can cause the service brakes to overheat, (and possibly fade/fail).
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BTW the signs that read "Trucks Use Lower Gears" are for trucks with a STANDARD transmission... (NOT for MHs or trucks with the Allison 6 speed automatic transmission).

If/when a lower gear is "SELECTED", (whether manually with the shift pad... or automatically by PacBrake activation), to protect itself, (and the diesel engine), the Allison will not "ACHIEVE" the "selected" gear until the coach slows to a speed low enough to safely do so...(as Gary said).

Mel
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OOPS!
I meant "SNUB braking", (not "Stab braking").
Sorry
Mel[/QUOTE]

I'll try that stabbing action Mel....smh, BTW a lot of my Co Workers now have Autos in their Heavy Haul Trucks and claim the Auto holds the load back well on grades, Reading and actually experiencing this are different....


Rolling down the grade into Bullhead City AZ yesterday (6% 12 miles) never touched the service brakes or gear selector....I'm doing it wrong? people ask for advice I give it, don't agree with the advice, ignore it, simple!
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Old 02-12-2016, 12:12 PM   #44
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Your Co-workers with auto's likely have 3 stage engine brakes. Much more braking power than an exhaust brake !
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Old 02-12-2016, 12:21 PM   #45
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Originally Posted by 96 Wideglide View Post
Your Co-workers with auto's likely have 3 stage engine brakes. Much more braking power than an exhaust brake !
Correct, the engine/engine brakes are not the only thing holding the weight back...there is something in between the engine and rear ends that has a part in it also.


BTW, My Coach has an Auto with only an Engine Exhaust Brake so I am quite aware of getting a light weight piece of equipment down the hill and that the Auto is also doing work along with the Diesel Engine Compression and Exhaust Brake....
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Old 02-12-2016, 02:42 PM   #46
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The exhaust brake will downshift the transmision on it's own.

X-2 on my 2007 been across smokies a lot
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Old 02-12-2016, 11:28 PM   #47
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I don't understand the difference be stab, snub and jab braking but I do know when speed builds up I push on the brake and slow down - most often the trans shifts down once or twice and then exhaust brake then holds the RV down to a comfortable speed. Gotta use some common sense for some of these things, no? Not talking about riding the brake down a long grade but simply slowing down to where the exhaust brake maintains the lower speed.
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Old 02-13-2016, 06:35 AM   #48
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Gotta use some common sense for some of these things, no?
Bob,



Frankly, common sense works FAR better in most instances BUT not all people have it. Either you do or don't. Plus you can't learn it in school.

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Old 02-13-2016, 07:48 AM   #49
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Rolling down the grade into Bullhead City AZ yesterday (6% 12 miles) never touched the service brakes or gear selector....I'm doing it wrong?
DMTTRANSPORT
IMO because you are rolling down grades without having to touch the service brakes or the gear selector you are definitely doing it RIGHT.
Mel
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Old 02-13-2016, 08:35 AM   #50
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IMO because you are rolling down grades without having to touch the service brakes or the gear selector you are definitely doing it RIGHT.
Mel
'96 Safari
Thanks Mel, actually pushed on the go pedal a few times to get moving...cockpit management
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Old 02-13-2016, 08:51 AM   #51
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Thanks Mel, actually pushed on the go pedal a few times to get moving...cockpit management
Nearly always possible to do this, but it may not be acceptable to many drivers who prefer to compromise a bit by coming down at a speed a bit above what the system will hold steady at, and use their brakes sensibly to keep it all under control. The alternative sometimes seems too slow and as stated, requires use of the throttle to avoid coming to almost a complete stop.
BTW as mentioned, on very steep downgrades, or if the road is in poor condition - eg the cobblestone road down from the butterfly sanctuary in Mexico - your speed may be below the lockup point of the transmission/drop-out of the auxiliary brake, so the exhaust brake won't come in and there is little retardation of any sort, and then the only choice is to use brakes
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Old 02-13-2016, 09:17 AM   #52
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Originally Posted by 96 Wideglide View Post
Your Co-workers with auto's likely have 3 stage engine brakes. Much more braking power than an exhaust brake !
FYI, the single stage engine brake has the same amount of hold back power as the three stage....think!
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Old 02-13-2016, 09:42 AM   #53
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Here is some really good info as to how to handle mountain driving:

https://www.fmca.com/motorhome/motor...-the-work.html
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Old 02-13-2016, 10:07 AM   #54
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Here is some really good info as to how to handle mountain driving:

https://www.fmca.com/motorhome/motor...-the-work.html

Good info!
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Old 02-13-2016, 10:07 AM   #55
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Here is some really good info as to how to handle mountain driving:

https://www.fmca.com/motorhome/motor...-the-work.html
Good read Gramps...
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Old 02-13-2016, 06:50 PM   #56
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I hate to harp on the point.....read the advice many times. The posts mentioning don't let your rpm's get to high because you can't downshift - true with my coach. Once your out of control....tough to get it back. Start in a lower gear at a lower speed because you can always shift to a higher gear and increase your speed.
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