Check brake system

[MattG]

Advancetrac service warning
Hill assist warning
Pre collision assist not available
Auto hold stop failure (something like that)
Check brake system


15" screen did a black out a couple weeks ago, no issues. Just before these warnings it did it again, related or not.

'22 SPP with 6k miles

Checked with my scanner, 0 DTC.
Checked brake fluid cap and level, no issue.

Fordpass only recognized the precollision, anti lock brake fault.

While driving, the alerts pop up and your brakes go to shit.

Any suggestions?

Sensor related...

 

[rd618]

Advancetrac service warning
Hill assist warning
Pre collision assist not available
Auto hold stop failure (something like that)
Check brake system


15" screen did a black out a couple weeks ago, no issues. Just before these warnings it did it again, related or not.

'22 SPP with 6k miles

Checked with my scanner, 0 DTC.
Checked brake fluid cap and level, no issue.

Fordpass only recognized the precollision, anti lock brake fault.

While driving, the alerts pop up and your brakes go to shit.

Any suggestions?

Sensor related...

Sounds like a faulty ABS sensor. They are used for individual wheel speed measures, all of those systems reference that data point.
Not sure what codes you pulled. But this resides in the ABS system set. Not emission controls for engine lights.

 

[MattG]

Yes I tapped OBD so if it's related to ABS, makes sense why no codes.

I've done some reading on it and from what I can find, it seems it's warning lights etc for people that are still able to drive normally.

The brake is so soft to the point of being unsafe.

 

[5280tunage]

that last statement makes me thing master cylinder, or something related to hydraulic pressure in the system. Just because a wheel speed sensor goes out, doesn't mean you should lose a safety system like brakes. The number of wheel speed sensors if torn off or fouled up 4wheeling in the past, I'd be dead by now if my brakes went out. Sure, no ABS etc, but come on. any vacuum lines or anything look disconnected or anything. Does it happen regardless of warm up, speed, conditions?

 

[MattG]

Wife called me yesterday on the way to pick up the kids, which is only a 5 minute trip. Said a bunch of warning lights and the brakes are hardly working. She was close enough to home (on our street) she limped it back.

I later started it up, instantly warnings.
Left it alone, came back to it a couple hours later; started fine, no warnings. Took it for a 5 minute drive and before I managed to return, warnings and brakes disappeared.

Conditions were cool at 40*, no snow.

 

[rd618]

im thinking the same as @5280tunage the very soft feel has nothing to do with sensors. Sensors will throw codes and disable systems. But will never soften or modify the brake feel.
I think master cylinder is faulty or you have air in it. Easy way to check is crack a bleeder on the rear and bleed some fluid. Lot of videos on YouTube how to do it yourself.

 

[Rob6805]

Take it to the dealer.

 

[MattG]

Take it to the dealer.

Yes, Roadside Assistance is picking up this afternoon.

 

[MattG]

Brake booster failure.
New one ordered.
2 weeks.
They are working on a rental

 

[MattG]

Brake booster replacement done and returned rental suv.
Ford's warranty costing $4k total.