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Old 11-13-2019, 02:25 PM   #1
Bus Nut
 
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Alternative parking/emergency brake?

Hey alls..


Looking for ideas. Will be swapping the transmission out of my IH 3800/Ward bus in the near future.


Plans are to go with an MT643. Problem is the AT545 that is currently in the bus has a driveline mounted parking brake and the 643 does not.


The 643 was offered with a driveline brake but it was a rare option. Not sure that the 545 brake will swap over and don't have the 643 here yet to compare.


So.. what are other options?


The bus has 4 wheel disc brakes.. all hydraulic. Has a Spicer N175 rear axle.


Haven't found any caliper options that have a mechanical parking brake built in.



I thought about using a line lock of sorts for exiting the bus to chock the wheels... but I really dont know about not having a mechanical brake of some form. Don't get me wrong... I know at speed, that little drum would go up in smoke in an emergency situation pretty quickly... and the 643 is capable of engine braking so that would greatly help get it slowed down in an emergency... but IDK.


Ideas?
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Old 11-13-2019, 02:38 PM   #2
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The best that I can come up with is to suggest that you look at an Allison 2000 series with the parking pawl instead of the 643.

You would have a 5 speed OD transmission or a 6 speed double OD transmission depending on year and programming.

Good luck.
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Old 11-13-2019, 02:55 PM   #3
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Quote:
Originally Posted by PNW_Steve View Post
The best that I can come up with is to suggest that you look at an Allison 2000 series with the parking pawl instead of the 643.

You would have a 5 speed OD transmission or a 6 speed double OD transmission depending on year and programming.

Good luck.

Would love to but it's cost prohibitive. If I could find something complete so I wouldn't have to track down controllers, harnesses, etc.. for a reasonable price, it'd certainly be an option.
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Old 10-15-2020, 06:03 PM   #4
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Drum or no drum

Quote:
Originally Posted by Mr4btTahoe View Post
Would love to but it's cost prohibitive. If I could find something complete so I wouldn't have to track down controllers, harnesses, etc.. for a reasonable price, it'd certainly be an option.
What did you end up doing? I found a good deal on a Allison 2000, no drum though like my AT545. Just go without an emergency brake.
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Old 10-15-2020, 06:04 PM   #5
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Wheel chocks. Simple, inexpensive. Not the most convenient solution, but it's safer than going without it. Also, I would not trust a parking pawl to hold an 18,000-lb bus on a slope.
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Old 10-15-2020, 06:24 PM   #6
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Quote:
Originally Posted by CHEESE_WAGON View Post
Wheel chocks. Simple, inexpensive. Not the most convenient solution, but it's safer than going without it. Also, I would not trust a parking pawl to hold an 18,000-lb bus on a slope.

its not a parking PAWL. its an actual parking brake.. a drum on the back of the transmission with a lever inside.. he absolutely cannot go without it unless his bus has air brajkes with spring. you cant even park at a gas station without the bus tryiong to roll forward.. there is no 'P' on a bus..



agreed that wheels should always be chocked if parked on any type of incline (or anytime for that matter).. however that brake is necessary to even exit the bus!!
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Old 10-15-2020, 06:28 PM   #7
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by the weay though allison does rate their parking Pawls at 30,000 lbs (15,000 for the gen 1). i forget the slope they rate them but its pretty impressive.. and to see one torn apart they are MASSIVE.



the parking pawl feature is only available on the 1000's and the 2000MH (motor home) series.. however it can be retrofitted into the opther model 2000s..



I had the 30,000 lb Pawl installed in the 1000 i swapped into my bus.. ive never replaced my shifter with the 'P' shifter I bought so I havent used the feature but it is there..
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Old 10-15-2020, 06:34 PM   #8
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I don't care what they're rated at. Look up the rollaway Fords and you'll see why.
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Old 10-15-2020, 06:36 PM   #9
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Quote:
Originally Posted by CHEESE_WAGON View Post
I don't care what they're rated at. Look up the rollaway Fords and you'll see why.



notice i said ive never installed the shifter for the park pawl.. I agree not to rely on a parking pawl to hold a vehicle esp a loaded one on any kind of incline..



and chocking the wheels is best paractice anywhere you go!
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