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07-24-2014, 06:40 PM
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#1
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Junior Member
Winnebago Owners Club
Join Date: Jun 2014
Location: Toledo, Ohio
Posts: 29
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Parking brake
Hey guys I have a stupid question for you, if the transmission doesn't have a parking pawl and if you have a emergency braking situation arise would putting your transmission in park to apply your electric parking brake hurt the transmission?
Jim
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07-24-2014, 06:50 PM
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#2
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Senior Member
Join Date: Nov 2005
Posts: 7,400
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Think if a tranny doesnt have a "parking pawl", it probably doesnt have a "park postion" either--just neutral [like Allison]..... Guess I dont understand your question??????
'
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Old Scout
2015 IH45 Foretravel
2003 Alpine 40' MDTS [Sold]
New Braunfels, Texas
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07-24-2014, 06:54 PM
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#3
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Junior Member
Winnebago Owners Club
Join Date: Jun 2014
Location: Toledo, Ohio
Posts: 29
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It has a park position but I think it only puts on the electric parking brake.
__________________
Jim & Laurie Dazley
2003
34d Brave Winnie
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07-24-2014, 11:21 PM
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#4
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Moderator Emeritus
Join Date: Oct 2011
Location: In a lawnchair
Posts: 11,993
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Jim, which chassis do you have?
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07-24-2014, 11:34 PM
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#5
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Senior Member
Join Date: Mar 2013
Location: The Evergreen State
Posts: 543
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Jim, you have an interesting question here. I think the electic brake Jim is refering to is the auto park on the p chassis. Keep us posted on your findings.
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07-24-2014, 11:59 PM
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#6
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Senior Member
Join Date: Jul 2012
Posts: 1,450
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In an true emergency, you must do what you got to do. On a gasser chassis, applying the parking brake while moving, will clamp down on the driveshaft and stop it from spinning. With all the weight on the tires, usually they do not slide on dry pavement. Something has to snap and it is expensive and will delay your trip. For Emergency Use Only!
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George R. - Fulltiming since January '03
2007 Newmar Mountain Aire 3991
2012 Chevy Malibu LT1
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07-25-2014, 03:48 AM
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#7
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Senior Member
Join Date: Mar 2013
Location: The Evergreen State
Posts: 543
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Quote:
Originally Posted by gruelens
In an true emergency, you must do what you got to do. On a gasser chassis, applying the parking brake while moving, will clamp down on the driveshaft and stop it from spinning. With all the weight on the tires, usually they do not slide on dry pavement. Something has to snap and it is expensive and will delay your trip. For Emergency Use Only!
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So then, in an true emergency brake situation if you put it in park while slamming the brake pedal you have 4 brakes on the wheel and the brake on the driveline, 5 total stopping the beast. Since there is no parking pawl, I don't think it will damage the transmission or engine  , but maybe new shoes on the drum behind the tranny.
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07-25-2014, 08:18 AM
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#8
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Junior Member
Winnebago Owners Club
Join Date: Jun 2014
Location: Toledo, Ohio
Posts: 29
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I have the Chevy chassie, and yes I'm talking about the electric parking brake. I heard that sometimes the brakes fade in downhill braking and without a manual parking brake I thought maybe useing the electric parking brake could help since it uses the drive line to stop. Thanks for all the input.
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Jim & Laurie Dazley
2003
34d Brave Winnie
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07-25-2014, 12:44 PM
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#9
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Senior Member
Join Date: Aug 2008
Location: Georgia
Posts: 8,638
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Just hope (R) doesn't engage before (P)
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2007 Fleetwood Revolution LE 40V
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07-25-2014, 04:10 PM
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#10
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Senior Member
Join Date: Oct 2002
Location: Madison, MS
Posts: 10,527
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Quote:
Originally Posted by jimdazley
I have the Chevy chassie, and yes I'm talking about the electric parking brake. I heard that sometimes the brakes fade in downhill braking and without a manual parking brake I thought maybe useing the electric parking brake could help since it uses the drive line to stop. Thanks for all the input.
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Yes, you can do that and likely will get the desired result. HOWEVER, the friction surfaces on the J71 AAPB used on your P32 are not intended to be used for braking a moving vehicle. They are sized to provide enough friction to HOLD a parked vehicle, and replacing worn out components can be expensive.
A far better alternative to your down hill concerns is to downshift the tranny to a lower gear before starting your decent. Use the service brakes abruptly and for short periods of time, rather than constant light pressure, to prevent the tranny/engine from over-revving.
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08-01-2014, 10:52 PM
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#11
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: Nov 2010
Location: Surrey, B.C.
Posts: 202
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Park Brake Prop Shaft
Quote:
Originally Posted by leesdx1
So then, in an true emergency brake situation if you put it in park while slamming the brake pedal you have 4 brakes on the wheel and the brake on the driveline, 5 total stopping the beast. Since there is no parking pawl, I don't think it will damage the transmission or engine , but maybe new shoes on the drum behind the tranny. |
I have a 2007 Itasca, W24 chassis, 60,000 miles. I recently experienced an auto park failure while driving resulting in a hugh repair bill! I was informed by the Workhorse Dealer that there is no way to replace the shoes in the drum. It is a totally enclosed, factory sealed component...... cost was $2000.00 plus labour, tax, etc. If it is used in an emergency, the result would be the same. Further details on this incident will be posted separately.
Knightly
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Knightly
2007 Itasca Sunrise 35A, W24 Chassis, Blue Ox, Toad-HHR. Retired 
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08-02-2014, 08:37 AM
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#12
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Senior Member
Join Date: Oct 2002
Location: Madison, MS
Posts: 10,527
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Quote:
Originally Posted by Knightly
I have a 2007 Itasca, W24 chassis, 60,000 miles. I recently experienced an auto park failure while driving resulting in a hugh repair bill! I was informed by the Workhorse Dealer that there is no way to replace the shoes in the drum. It is a totally enclosed, factory sealed component...... cost was $2000.00 plus labour, tax, etc. If it is used in an emergency, the result would be the same. Further details on this incident will be posted separately.
Knightly
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Your W24 chassis is apparently equipped with the J72 AAPB, which is a different animal than the J71 system used on the P32 chassis. ONLY the 2005 P32s got the J72. Therefore, what you were told (which I suspect is totally false) does not apply to the owners of J71 equipped chassis.
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