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  #13  
Old 04-09-2013, 11:49 AM
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Re: Vehicle rolling in Park

Thanks for all the feedback guys. I guess I should be in the habbit of using my parking brake more often, especially when I am leaving the vehicle.

It just felt so odd to be sitting in the vehicle while it is in 'Park' and still have the vehicle rolling backwards. Maybe not headed to the dealership afterall!
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Old 04-09-2013, 12:04 PM
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Re: Vehicle rolling in Park

Quote:
Originally Posted by padgett View Post
Just as a point of interest: "49 C.F.R. § 571.114 Standard No. 114; Theft protection.
(b) Drive the vehicle forward up a 10 percent grade and stop it with the service brakes. Apply the parking brake (if present). Move the shift mechanism to the “park” position. Note the vehicle position. Release the parking brake. Release the service brakes. Remove the key. Verify that the transmission shift lever or transmission is locked in “park.” Verify that the vehicle, at rest, has moved no more than 150 mm from the position noted prior to release of the brakes.
ref §*571.114***Standard No. 114; Theft protection. :: PART 571--FEDERAL MOTOR VEHICLE SAFETY STANDARDS :: CHAPTER V--NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION :: Title 49 - Transportation :: Code of Federal Regulations"

BTW when the wheels were rolling were some spining backwards on the ice ?

I only observed the drivers front wheel and did not note which direction it was spinning, but the friend who I was picking up said the wheels were rotating in the forward direction, going against the backward motion of the vehicle.
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Old 04-09-2013, 12:56 PM
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Re: Vehicle rolling in Park

That makes sense, what you are seeing is differential action with a locked driveshaft and an open axle. Would only happen on a very slippery surface. Wonder if anyone makes a locker for the 230mm rear axle ?
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Old 04-09-2013, 06:15 PM
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Re: Vehicle rolling in Park

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Originally Posted by Studgun View Post
Interesting.

In Australia you are legally obliged to apply the parking brake when you leave your vehicle to prevent runaway vehicles and theft.

Prevent theft? Must be some dumb criminals.
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Old 04-09-2013, 06:30 PM
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Re: Vehicle rolling in Park

Blaming it on open diffs is nonsense. Whether it is the Forester with open front and rear diffs and center LSD or the Legacy with 3 LSDs (manual transmission both), when you put the car in first gear and turn off the engine that is where the car stays. Yes - can it be pushed ? Of course but there are a lot of parts that need to move in order for the car to inch forward. And a lot of sweat.

Blame the parking pawl on an automatic transmission - when you place the trannsmission in Park, a pin should engage one of those notched wheels, therefore preventing it from rotating. Blame the electromagnets that should have engaged the pin; blame the driver for shifting into Park before coming to a full stop; or for relying on P to hold the car on inclines, putting pressure on the Pawl and/or its spring - but don't blame the differentials.

Owners of automatic tranny cars should use the parking brake at all times, unless parking on a flat surface. And the correct use should be : FIRST the parking brake THEN shift into Park.

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Old 04-10-2013, 06:18 PM
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Quote:
Originally Posted by f1anatic View Post
Blaming it on open diffs is nonsense. Whether it is the Forester with open front and rear diffs and center LSD or the Legacy with 3 LSDs (manual transmission both), when you put the car in first gear and turn off the engine that is where the car stays. Yes - can it be pushed ? Of course but there are a lot of parts that need to move in order for the car to inch forward. And a lot of sweat.

Blame the parking pawl on an automatic transmission - when you place the trannsmission in Park, a pin should engage one of those notched wheels, therefore preventing it from rotating. Blame the electromagnets that should have engaged the pin; blame the driver for shifting into Park before coming to a full stop; or for relying on P to hold the car on inclines, putting pressure on the Pawl and/or its spring - but don't blame the differentials.

Owners of automatic tranny cars should use the parking brake at all times, unless parking on a flat surface. And the correct use should be : FIRST the parking brake THEN shift into Park.
I have had two automatic SUVs (Chevy Blazer 4x4 and a Jeep Liberty). I haven't used the parking break in either, and destroyed both vehicles' parking breaks when someone else drove my car and put it on without me noticing and driving sluggishly before figuring it out, OOPS!

I have a new GC on order, and I plan to treat this one better than my last two. My question is what is the reason for putting the parking break on first before going into park?thanks!
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  #19  
Old 04-10-2013, 08:33 PM
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Re: Vehicle rolling in Park

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Originally Posted by Lanrete View Post
I have had two automatic SUVs (Chevy Blazer 4x4 and a Jeep Liberty). I haven't used the parking break in either, and destroyed both vehicles' parking breaks when someone else drove my car and put it on without me noticing and driving sluggishly before figuring it out, OOPS!

I have a new GC on order, and I plan to treat this one better than my last two. My question is what is the reason for putting the parking break on first before going into park?thanks!
So the brake is actually stopping the vehicle from moving, and not the parking pawl in the transmission. The parking pawl can, and does break sometimes if abused.
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  #20  
Old 04-10-2013, 08:40 PM
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Quote:
Originally Posted by stashgto View Post

So the brake is actually stopping the vehicle from moving, and not the parking pawl in the transmission. The parking pawl can, and does break sometimes if abused.
Gotcha, thanks, great to know!
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Old 04-12-2013, 08:32 AM
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Re: Vehicle rolling in Park

The issue is not the open diff, the issue is parking on ice on an incline. Although Florida is flat, my driveway is quite steep and have yet to find anything with 4 wheel disk brakes that can be relied to hold on it (drum brake cars have no problem).

If I must park on the incline I stand on the parking brake and then put in park or first gear also (have seen cars just in first turn the engine if under 4 liters).

Last night when I parked the Vixen in the driive after camping for a few days (need to dump and flush the waste tank before putting away) and used all four (in first, parking brake set, turn front wheels out of the incline and use a chock.

BTW the idea of setting the parking brake first on an incline is to keep all of the load off the pawl. If pops out of park after then the parkiing brake did not hold (and few do any more).

Incidently after 180 miles the fuel gauge just came off FULL and this is a 6300 lb RV with a 2.4 liter "old design" turbo diesel. Have never had any problem keeping up with traffic and there is a "sweet spot" in 5th from about 60 to 75 mph.
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  #22  
Old 04-19-2013, 05:25 PM
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Re: Vehicle rolling in Park

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Originally Posted by AAAA View Post
I have one answer to the question as to why "Americans" don't use the parking brake. My driver's education teacher told us not to use it as it can freeze in the on position in the winter. But that was a loooong time ago.
And in fact, this happened to me a couple times in my 2004 Saab 9-5. Apparently the tubes that tunnel the cable to the brakes can get water in them and freeze up. Solution? If you have an automatic, don't use the P-brake.
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Old 04-19-2013, 08:34 PM
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Re: Vehicle rolling in Park

You just reminded me of part of the conversation with my son which I just asked him about. He was scared to use the parking break thinking he might fail his test. I assured him this wouldn't be the case at least I hope so.
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Old 04-20-2013, 11:07 AM
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Re: Vehicle rolling in Park

When in doubt, a couple of bricks can help.

BTW the title is misleading, the vehicle in question never "rolled in park", it "slid on ice in park". Big difference.

ps back in the day, a 4" slit piece of garden hose on the "release" handle made it fly-off.
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