Antilock Brake Fault

[BigMattT]

While coming to a stop on the highway in traffic with normal regen braking indicators (not using cruise control or 1 pedal driving) another car pulled in between us and the truck ahead of us. Even though regen brakes were already engaged and we were stopping, pre-collision sensors alerted, brakes engaged hard to a full stop, dash lit up with alerts and chime, and we lost power brakes.

Managed to pull it off highway. Off/on, reset sync.. no change. Let it rest an hour parked, off/on, no change.

Friction brakes are working with the extra effort on the brake pedal I’d expect with power brakes not working, and anytime we come to a near-stop, the parking brake turns on automatically bringing the truck to a sudden lurch-stop.

Got a tow to a dealer here in SoCal (called around and everyone but one quoted a week before they could even look at it). Was very impressed with @Ford Motor Company FordPass Roadside Assistance app and communication for the tow part.

I didn’t see other posts here about brake system faults, so figured I’d mention it.

Really hoping they just need to stick a paperclip in the reset hole to fix it. We have group travel plans next weekend we need a truck with ProPower for.

2023 October build XTL ER with 1,400 miles on it.

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[BigMattT]

 

[farmtruck]

My first check would be the fuses. #23, #28, #29 in the frunk fuse panel. While the brakes are hydraulic, they are electrically applied and if the fuses blow, the park brake applies.

 

[Heliian]

You've had a failure in the abs or control system, your dealer will have to diagnose. Could be a sensor, wire, control valve. The parking brake thing is weird too, maybe that's just a setting though.

 

[BigMattT]

Update: Brake Booster failed. Part on back order with no ETA.

Waiting to see about a loaner/rental.

A little unnerving to have brakes fail at 1,400 miles.

 

[BigMattT]

Got the truck back yesterday 4/12. We went from no eta/no part available, to Ford corp mentioning some sort of expedited process happening, to getting a surprise call the truck was ready.

Can’t recommend Puente Hills Ford in SoCal highly enough. Received proactive update calls from them twice daily, reasonable discussions about getting us a loaner: all very organized.

Also had received a call from Ford after it was towed to dealer Saturday. Spoke with them again Tuesday, when they opened a case and said they would work on expediting a part… no idea the veracity of that having happened.

Best of all, we can stop the truck now.

Fingers crossed it was a fluke. The part they replaced was very much electrically fried.

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