Brakes Preventing Vehicle from Backing Out of Driveway

[expy22]

Hi all. I have a 2022 Ford Expedition Max. Intermittently, the brakes will prevent our vehicle from backing out of the driveway. Usually, it will not move at all unless the gas is pressed hard. Occasionally, it will stop after we back up a small distance, and then you have to press the gas hard to get it to continue backing up. Our driveway is about a 5% grade. It mostly does this when the weather is cold in the winter. We always use the electric parking brake when parking, and we always disengage it when backing up. The dash indicates it was disengaged. I know this sounds like reverse brake assist, but the vehicle gives no indication that reverse brake assist is being activated when this happens. There are no alert tones and no dash messages appear when this happens. It will also do this with reverse brake assist toggled off in Sync, but it does seem to do it less often. Has anyone else had this happen? What was the issue?

 

[Mack444]

Sounds like auto hold or hill start assist is fighting you. Happens to us on our long country driveway too depending on the angle we hit on the way out of the parking corner. Not sure if this is a setting on yours and haven’t looked through our sync4a in awhile, but I would look for those 2 things in settings if you want to try turning off.

 

[expy22]

Thanks for the reply. Auto-hold/hill assist is an option in mine, but I have made sure it is toggled off.

 

[Nacicat1]

Same thing happened on mine it's because one of my bolts on your caliper that holds your actual pads has broke so the actual caliper slits up and down and locks it in place so you can't back up replace the bolt everything was fine

 

[Mr Big]

Could it be the parking brake sticking? Next time before moving, activate the parking brake, then deactivate it. Because of a recall on my 2021, they had the parking brake automatically activate. It was a pain until they fixed the issue.

 

[inmanlanier]

A little late to post, but if this is a trailer with hydraulic brakes, you must install the solenoid valve in the trailer brake line that energizes to disable the brakes when backing up. "pulse" brakes use the force of the trailer weight to press (energize) the master cylinder on the trailer. Going in reverse is the same as going forward with your car and applying the car's brakes. The brake valve (energized by a solenoid) is wired to your reverse lights so that when you back up, the reverse light circuit energizes the solenoid valve (closing it) to disallow any braking action in the trailer.