Rolling backwards down hill in snow
#1
Rolling backwards down hill in snow
Has anyone else had this issue come up? My 2013 XF AWD rolled very slowly down my driveway twice in the last few months. Once after an ice storm and once during a recent snow storm. Both times I pulled into the driveway facing up hill and by hill, it really isn't that steep. First time I woke up to my wife telling me my Jag had the back end of the car in the street and she had pulled it back into the driveway, I went out about 2 hours later and it was almost back into the street again. So I pulled it up and set the parking brake and it didn't move any more.
Second time was last week after it snowed I pulled into the drive way and put the car in park and let my foot off the brake, by the time I opened the car door it was moving. It rolled backward at least 3 or 4 inches, I could see each tires tracks in the snow and it didn't slide it rolled.
I took it to the dealer and was told that the rear is the only wheels that lock up in park and that the front may have rolled but the rear would may have slipped in the snow... really the tech told me to set the parking brake to prevent it from happening again. 53 vehicles and at least that many motorcycles and I have never had to set the parking brake to prevent a car or truck from rolling in snow or ice. If it stopped it stayed where I left it.
Thoughts... and no I am not ranting just to say bad things.. I love my Jag this just shocks me that I would be told to set the parking brake to prevent it.
Second time was last week after it snowed I pulled into the drive way and put the car in park and let my foot off the brake, by the time I opened the car door it was moving. It rolled backward at least 3 or 4 inches, I could see each tires tracks in the snow and it didn't slide it rolled.
I took it to the dealer and was told that the rear is the only wheels that lock up in park and that the front may have rolled but the rear would may have slipped in the snow... really the tech told me to set the parking brake to prevent it from happening again. 53 vehicles and at least that many motorcycles and I have never had to set the parking brake to prevent a car or truck from rolling in snow or ice. If it stopped it stayed where I left it.
Thoughts... and no I am not ranting just to say bad things.. I love my Jag this just shocks me that I would be told to set the parking brake to prevent it.
#2
Sounds like a combination of a steep hill and poorly suited tires. If you have summer tires, you're screwed. If you have all seasons, they may be worn. Winter/snow tires are your best bet.
I doubt the parking brake makes any difference--the rear wheels are already going to be locked in park in this car and the parking brake would lock the rear wheels.
In a front wheel drive car, putting it in park would lock the front wheels and the parking brake would lock the rear wheels, which would be better in your situation!
I doubt the parking brake makes any difference--the rear wheels are already going to be locked in park in this car and the parking brake would lock the rear wheels.
In a front wheel drive car, putting it in park would lock the front wheels and the parking brake would lock the rear wheels, which would be better in your situation!
#3
Well he said it rolled and did not slide so the tires are not even a factor.
I have never heard of an automatic transmission that had a park position that did not mechanically lock the transmission. Now some very early automatics did NOT have a park position and yes those required the park brake to be set.
Maybe the AWD models have something different?
If you find out please post back.
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I have never heard of an automatic transmission that had a park position that did not mechanically lock the transmission. Now some very early automatics did NOT have a park position and yes those required the park brake to be set.
Maybe the AWD models have something different?
If you find out please post back.
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#4
#5
Trust me if I find out I will post it. As far as drive way being to steep, that isn't it. I have had a steep driveway in the past and mine is far from that. Tires are the factory all season and have well over half tread life left.
The Service Adviser told me the mechanic (most experienced Jaguar Mechanic at the Dealership) said this could be normal and to just set the parking brake...
I figure it will snow again this weekend I plan to try and video the car without the parking brake set and with it set so I can get a better idea from both sides of the car. Too bad I don't have 4 Garmin VIRB's I wouldn't have to sit out in the cold.
The Service Adviser told me the mechanic (most experienced Jaguar Mechanic at the Dealership) said this could be normal and to just set the parking brake...
I figure it will snow again this weekend I plan to try and video the car without the parking brake set and with it set so I can get a better idea from both sides of the car. Too bad I don't have 4 Garmin VIRB's I wouldn't have to sit out in the cold.
#6
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joey4420 (01-31-2015)
#7
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#8
I have heard of AWD vehicle not holding a car in a spot. My cousin Audi has done it on several occasion. It has something to do with how the tranny unlocks from the fly wheel when the car is parked. There is no pressure being generated buy the engine and as the fluid backs out of the system, the car can roll. It saves the system from having the cars weight rest on the tranny's lock pin. Your the first Jag I have heard about doing this.
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joey4420 (02-02-2015)
#9
#10
#11
I never heard of it either until I took a ride with my cousin last summer in his Audi RS. We had gone to dinner when he ran out of the restaurant to make sure his parking brake was on. When I inquire, he told me that his car rolled when parked on hills.. His dealership in Va. told him he had to use the parking brake as stated in his owners manual. My Rav4 nor my wife's Range Rover has ever done this but we general use the parking brake in our cars.
#12
The problem is most of us are old school and remember when cars had a dedicated parking pawl in the trans that locked the car in place. Most of your newer cars (especially the euro brands) now use the regular brakes to hold park, and because the US DOT requires a separate Emergency Brake system, that system is used to provide Emergency stopping and additional holding in park. My guess is there is a fix to your problem but you will need a knowledgeable DEALER to fix it. In the mean time USE THAT E BRAKE as much as possible, because with or with out you in it, ITS STILL YOUR CAR IN AN ACCIDENT..lol
#13
#15
The problem is most of us are old school and remember when cars had a dedicated parking pawl in the trans that locked the car in place. Most of your newer cars (especially the euro brands) now use the regular brakes to hold park, and because the US DOT requires a separate Emergency Brake system, that system is used to provide Emergency stopping and additional holding in park.
Last edited by amcdonal86; 02-04-2015 at 04:57 PM.
#16
#17
Has anyone else had this issue come up? My 2013 XF AWD rolled very slowly down my driveway twice in the last few months. Once after an ice storm and once during a recent snow storm. Both times I pulled into the driveway facing up hill and by hill, it really isn't that steep. First time I woke up to my wife telling me my Jag had the back end of the car in the street and she had pulled it back into the driveway, I went out about 2 hours later and it was almost back into the street again. So I pulled it up and set the parking brake and it didn't move any more.
Second time was last week after it snowed I pulled into the drive way and put the car in park and let my foot off the brake, by the time I opened the car door it was moving. It rolled backward at least 3 or 4 inches, I could see each tires tracks in the snow and it didn't slide it rolled.
I took it to the dealer and was told that the rear is the only wheels that lock up in park and that the front may have rolled but the rear would may have slipped in the snow... really the tech told me to set the parking brake to prevent it from happening again. 53 vehicles and at least that many motorcycles and I have never had to set the parking brake to prevent a car or truck from rolling in snow or ice. If it stopped it stayed where I left it.
Thoughts... and no I am not ranting just to say bad things.. I love my Jag this just shocks me that I would be told to set the parking brake to prevent it.
Second time was last week after it snowed I pulled into the drive way and put the car in park and let my foot off the brake, by the time I opened the car door it was moving. It rolled backward at least 3 or 4 inches, I could see each tires tracks in the snow and it didn't slide it rolled.
I took it to the dealer and was told that the rear is the only wheels that lock up in park and that the front may have rolled but the rear would may have slipped in the snow... really the tech told me to set the parking brake to prevent it from happening again. 53 vehicles and at least that many motorcycles and I have never had to set the parking brake to prevent a car or truck from rolling in snow or ice. If it stopped it stayed where I left it.
Thoughts... and no I am not ranting just to say bad things.. I love my Jag this just shocks me that I would be told to set the parking brake to prevent it.
http://www-odi.nhtsa.dot.gov/acms/cs...5V519-3240.PDF
Funny the trans in the diagram looks like the ZF 6hp26-8 used in our cars, the torque specs are the same too?
Last edited by Bigg Will; 02-05-2015 at 02:01 AM.
#18
Electric Park Brake | TRW Automotive
Parking Brake, Electronic < Technical Glossary < Innovation & Technology < Volkswagen International
Continental designs electric parking brake for cars with drum brakes
SKF Electronic Parking Brake
Electromechanical parking brake > Glossary > advice > Audi St. Lucia
This IS the way of the modern transmission!
#19
Big Will that Ford recall is very interesting and seems it would apply to anything with the ZF 6 speed in it. Also sounds like the transmission will mechanically lock in park too?
Surprised that it only required a pan drop and not removal of the transmission to do the repair.
Again no, the tires rolled and did not slide. Read what he said and stop doubting. We are concerned with facts!
Hoping to find if AWD does away with the mechanical locking of the transmission?
And the reason for the change?
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Surprised that it only required a pan drop and not removal of the transmission to do the repair.
Again no, the tires rolled and did not slide. Read what he said and stop doubting. We are concerned with facts!
Hoping to find if AWD does away with the mechanical locking of the transmission?
And the reason for the change?
.
.
.