Parking brake fail? Wet, not icy surface

[nofreecell]

Looking forward to reports from the shop about this situation.

Us too. Dealer says when they picked it up all 4 tires had low pressure. No lights were on when I was coming home from the store. Driver side rear had been at 28 the night of my son’s surgery so I inflated it (at 10 pm) and the lights never came back on . . . may just be cursed

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[TaxmanHog]

Us too. Dealer says when they picked it up all 4 tires had low pressure. No lights were on when I was coming home from the store. Driver side rear had been at 28 the night of my son’s surgery so I inflated it (at 10 pm) and the lights never came back on . . . may just be cursed

That's pretty low, depending on wheel/tire fitted to the truck, (see door jam tire placard) the pressure should be 36 to 42 psi

 

[nofreecell]

The display was very clear showing all 4 tires and their pressures. He said it had happened once a few days earlier. Maybe colder (but I think it was just as cold during the last few weeks). Why all 4 tires were low the next morning is just crazy. I guess they can see when these sensors come on, but seriously, since there have been other reports I would think Ford could alert all their owners by email or a blast text that this is an issue

 

[TaxmanHog]

The display was very clear showing all 4 tires and their pressures. He said it had happened once a few days earlier. Maybe colder (but I think it was just as cold during the last few weeks). Why all 4 tires were low the next morning is just crazy. I guess they can see when these sensors come on, but seriously, since there have been other reports I would think Ford could alert all their owners by email or a blast text that this is an issue

The tire pressure can drop several PSI with the cold season, all four dropping is a sign of environmental change.

Yes, they and the owner can see it from the vehicle online profile.

https://www.ford.com/support/vehicle-dashboard/

 

[nofreecell]

The tire pressure can drop several PSI with the cold season, all four dropping is a sign of environmental change.

Yes, they and the owner can see it from the vehicle online profile.

https://www.ford.com/support/vehicle-dashboard/

Yes, we had snow early Sunday to midday when the temps were upper 30s (38, 39) and rain turned to light rain at the time of the incident. No tire lights were on for the short trip I made Sunday afternoon. Probably never really know what happened and just replacing everything that could have contributed.

 

[NW Ontario Ford Lightning]

Low tire pressure would Increase the contact area of rubber to surface. Could make sliding LESS likely.
The weight of the truck doesn't change, lower tire pressure increases contact area, reduces contact pressure. The area x the contact pressure = the weight of the truck.
Higher contact pressure could cause the ice to phase change to water - like under an ice-skate - and reduce friction.

 

[DenverDan]

Vehicles slide all the time on ice when they are parked. The truck is fine. suggest sanding and salting the driveway.

 

[nofreecell]

Yesterday I returned from the grocery store and parked my son’s truck in the usual spot and plugged it in. By the time I got back in front of the vehicle to get groceries out of the passenger side the truck began rolling back into the street. The charger pulled out of the port (connector is damaged and needs to be replaced). My son who is recovering from major surgery and limited on activity came into the garage and guided me to park again (we have had snow so wanted to make sure I was completely on a clear spot). I again put the truck in park, turned on the parking brake, vehicle was powered off. I walked around and got two bags of groceries with no problem, but when I went back to get the rest, as I was 1/2 way in the door bending to pick up stuff from the floor board, the truck again began to roll trapping me between the door and the vehicle. I was able to grab the overhead handle and step up on the running board as it rolled back into the street.
I had the dealership come and get the car. My son uses a different service department since the one at his dealership is inefficient, but that is further away. They may get to look at the truck by tomorrow. They don’t see any sensors off, but because I was honest, the sales manager said maybe it is my inexperience driving the vehicle or that it had a low tire pressure light last week, or the severe weather, all that sort of BS when a car guy talks to a woman. I grew up driving a split axle cattle truck so know how to drive and especially park.
Had I slipped (it was raining but hadn’t started to ice over yet) I would have been at least run over by the front wheel.
I am going to try and alert everyone because the service manager said he hadn’t seen any thing on any forum but I saw here that there have been recalls and some issue with wiring on the rear axle or something.
A vehicle in park with a parking brake activated should stay parked.
Regardless of the repair I am ordering an airline bumper or something like that and now refer to the vehicle as Christine (for you Steven King fans).

So final answer:
(unfortunately someone retitled my topic which took people off on tangents)
Nothing wrong with the truck, tires are under inflated (by son didn’t know that he should go by the door sticker vs what the truck was telling him so they were 32 psi) . His tires have 10,000 miles left of them but he is replacing them.
So, we will never know except this may have been a perfect storm situation. I parked exactly where he has parked all winter. It has snowed and frozen many days this winter. Nothing was particularly unusual on Sunday except for light rain.
He is parked in the same place today. It is sunny and the snow and ice are melting all around him. The parking brake comes on as expected when he parked the car.
THere is no snow melt /salt any where as has been the case for several weeks so fingers crossed and thanks for all who contributed thoughtful input.

 

[nofreecell]

Vehicles slide all the time on ice when they are parked. The truck is fine. suggest sanding and salting the driveway.

Unfortunately someone changed the topic. The driveway was not icy (I walked up it in sneakers ). Boston ran out of salt awhile ago and my son hasn’t had any issues this winter, and neighbor did I the entire week I was driving while he was unable to.

 

[Grumpy2]

Nothing wrong with the truck

That is always good news.

I hope the worst of your winter is behind you now.

And THANKS For your time as a nurse. They are special people.

 

[Firn]

So there is nothing wrong with the truck. The parking brake and motor drivetrain lock both work fine?

But it also did not slide down the driveway on ice?

So how did the truck move then?

 

[TaxmanHog]

Retitling the thread back to "Parking brake fail" is wrong, it wasn't proven by the service department.

More than likely the tire slid on the surface and yes a "perfect storm" conditions brought it about, hopefully it does not repeat, but definitely consider, curbing the front wheels (if you have a curb close by)

 

[Runaway Tractor]

How is this topic still going 7 pages later? What's next? It levitated?

 

[TMND]

How is this topic still going 7 pages later? What's next? It levitated?

Nothing better to hash out

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