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Old 04-15-2016, 04:17 PM   #11
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Utah buses with retarders? They don't seem to have a great deal of buses at once but the sales seem pretty steady.

I had to look up retarders to understand what they were. Why don't those work like the dynamic braking systems that generate power instead of heat? Oh, probably not practical unless you've got a hybrid bus. Same principals though.
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Old 04-15-2016, 04:22 PM   #12
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Old 04-15-2016, 04:42 PM   #13
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Seen it. Wish I had one.
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Old 04-15-2016, 09:47 PM   #14
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Colorado Revised Statues - 42-4-1901

COCODE

the fine print in the Colorado law you are referring to only applied to bus operating in "mountainous conditions".

in 2010 it was repealed by house bill 10-1232

http://www.leg.state.co.us/clics/cli...e=1232_enr.pdf

not all of Colorado is mountains

my ex wife drove school buses locally here in Colorado and none of her buses ever had retarders on them. but im way out in the plains... no hills for miles.
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Old 04-15-2016, 10:02 PM   #15
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Quote:
Originally Posted by Robin97396 View Post
Utah buses with retarders? They don't seem to have a great deal of buses at once but the sales seem pretty steady.

I had to look up retarders to understand what they were. Why don't those work like the dynamic braking systems that generate power instead of heat? Oh, probably not practical unless you've got a hybrid bus. Same principals though.

not only do you have to have an electric motor to turn into a generator, thus creating resistance, you also have to disperse that energy somewhere..

in my chevy volt if I ran it up a hill forced in gasoline mode wit ha full battery pack (no its not efficient.. just a demonstration)..

then when I went down the other side.. and switched to electric only at the top.. on a long hill the battery would full-charge and I would lose all dynamic braking.. the pedal would go down about halfway till i felt any braking.. which was then the normal friction brakes...

mechanical retarders use the high compression of a diesel engine to create the resistance against gravity.. thus helping the brakes..

many air-brake busses are All drums... Drums have more mass and can take longer before losing effectiveness than a disk brake.. however a disk brake will recover quicker than a drum brake....

using your retarder or jake-brake as much as possible helps to keep your brakes cool. I can always tell an inexperienced truck driver when going down the mountains because I will hear the jake brake only being used part of the time... those often are the ones I smell with hot brakes at the end of a hill...

-Christopher
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Old 04-21-2016, 10:17 AM   #16
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Anyone have an idea what a driveline retarder adds to the cost of a bus (on average)? I.E. how much more would you expect to pay for a bus already featuring one?
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Old 04-21-2016, 10:51 AM   #17
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I don't know if there is a retarder for a rear engine bus, but I was thinking of adding an exhaust brake to mine since I do drive into the mountains around Phoenix 4 or so times a year. Anyone familiar with these?? Can they manually be switched on and off?
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Old 04-21-2016, 11:12 AM   #18
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I don't know if there is a retarder for a rear engine bus, but I was thinking of adding an exhaust brake to mine since I do drive into the mountains around Phoenix 4 or so times a year. Anyone familiar with these?? Can they be manually be switched on and off?
I'm also thinking that maybe just an exhaust brake or Jake brake would work for me. My budget is pretty tight though... (aren't they all?)
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Old 04-21-2016, 02:20 PM   #19
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Don't know about anyone else but the exhaust brake kit from caterpillar for the 3126b is 960 bucks........ugh!

Anyone know an aftermarket that is less expensive?

https://parts.cat.com/en/catcorp/177-9547
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Old 04-21-2016, 03:11 PM   #20
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My rear engine bus has a retarder, it's hydraulic and on the rear of a MD3060 Allison
transmission. On the down side of Soldier Summit over the Rocky Mountains I never
had to go past 3 on the retarder with the max available position being a 6. It was a
joyful ride with no worries on the steep grades.
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