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.

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