Brake Hold

[tbinmd]

Perhaps it is different in the Powerboost then. how much actual brake vs how much brake regen is used is controlled by the truck, not by the pedal (at least how I understand it).

But brake regeneration is not brakes, yes it slows the truck down, but it will not stop the truck or provide emergency stopping power. The ABS pump does control the valves and how much hydraulic pressure gets sent to the calipers. The general feel is there of normal brakes.

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[FrankThompson]

But brake regeneration is not brakes, yes it slows the truck down, but it will not stop the truck or provide emergency stopping power. The ABS pump does control the valves and how much hydraulic pressure gets sent to the calipers. The general feel is there of normal brakes.

If this is so, would it not always apply brakes the same level no matter what? I can definitely see/feel when it is using the electric motor to brake me vs the disc brakes. So where is the disconnect? How is the truck sometimes determining to use the disc brakes to slow down based on me pressing the brake pedal and other time using the electric motor?

 

[Oxford_Powerboost]

Perhaps it is different in the Powerboost then. how much actual brake vs how much brake regen is used is controlled by the truck, not by the pedal (at least how I understand it).

I’m with you - because I’ve noted when descending long hills riding the regen to charge up - once the battery is fully charged that regen bar goes away and the disk brakes are applied. During that time my pedal pressure doesn’t change, nor does the braking force applied. But the truck is still transitioning from regen to service brakes

To the OP’s original post - I love auto hold. I turned it on when I got my truck and haven’t turned it off since. I first had it on my Genesis G70 before this truck. One thing I preferred from the way genesis implemented it was that it almost worked like a golf cart park brake - you’d stop and the auto hold light would stay white, meaning available but not activated. Then you just add the slightest bit of extra pressure to engage the auto hold. This let you decide whether you wanted to creep or not without having to press the button to activate/deactivate. Vs the f150 just engages auto hold as soon as you’re stopped regardless.

One thing I disliked from the genesis that the F150 fixes is that the auto hold on that car would default to off every ignition cycle

 

[FrankThompson]

I also found these sources saying the truck is determining the blend:

Stepping on the brake pedal begins the braking process and the truck’s various control units determine and blend the right amounts of regenerative braking and hydraulic braking. Regardless of the blending percentage, the driver does not notice anything different in vehicle dynamics or operation.

source: https://thebrakereport.com/regenerative-braking-virtually-invisible-in-f-150-hybrid/

MotorTrend reports that for the 2021 line of hybrid pickups, Ford has gone from vacuum braking to electric-power braking. This was done to support the blending of regenerative and friction braking. The tester, Frank Markus, reports that the braking feel is all out of wack. Around town, the brake pedal can feel a little stiff and “wooden.”

source: https://www.motorbiscuit.com/the-20...-flaw-that-may-stop-buyers-but-not-the-truck/

 

[tbinmd]

Yes, truck is determining the bled, but it still is not drive by wire, because the brake pedal is still connected to a master cylinder. It's a hybrid system... lol. It's the typical EV braking system. At least in the US true drive by wire brake systems are not allowed by DOT, same goes for steering drive by wire systems. Only thing currently allowed is throttle by wire and those have been with us for 20 years.

Just like traction control, the ABS pump can apply brake pressure to various wheels and amounts of pressure.

 

[FrankThompson]

Ok, so maybe I got the terminology wrong, but my pressing the brake pedal is not directly controlling the brakes. There is something in the middle adjusting the blend of regen and actual brakes. In layman's terms I would consider that "drive by wire" as something in the middle is making a decision based on other factors besides just my input.

It's like how people commonly mistake what "autopilot" means in Teslas. They don't realize that real actual "autopilot" doesn't mean self driving, it means a very complex driver assist which means hands/feet off, but still paying attention.

Edit: just to add that I've had cars where the ABS system is messed up and you lose brakes even though you are pressing them. It wasn't the pedal or the actual brake system, but the logic in between which caused brake loss. To me a disconnect like that (even just basic ABS) is in itself a bit like fly by wire, but I get that i'm probably using the terminology wrong and I'm sorry for that

But I did learn some stuff, so thanks

Edit2: after a bit of rabbit holing, yes, this is likely not "fly by wire" (converting of input to electrical signal and back to a physical output). Sorry for the wrong use of the term. I really just meant that the truck was to some degree controlling the brakes with our without your foot on them when stopped.

 

[someday]

I'd use it if it was more convenient to turn on and off. My previous car had it as well, but it had a button in the center console to enable it, and I only used it in certain situations. Having to dig into a menu is just enough friction to make me not use it.

I'm also not convinced that it will hold on my PB if the engine comes on while stopped. The truck shudders a bit when it does.

 

[Bikertrash]

I’ve used it on both my Powerboost trucks. Love the feature and have had the ICE come on while on autohold and the truck did not move.

it’s only on my 2022 that I’ve seen a few instances where once I’m stopped after a few seconds the truck moves a couple of inches. In 200 miles it’s happened 4 times.

 

[Bugzuki]

My wife's 2020 Escape has a button for it on the center console. We don't really use it in that truck so I never looked for it in the PB. I was curious if it had it but didn't see a button, so I figured it didn't.

 

[TheGoatman]

Tried it and like it but needs a button on the console.
Had a bmw rental for 2 weeks with it and a button on the console. Def better so you could quickly toggle it on or off depending if it was getting in the way for certain traffic.

 

[Egilson1]

You can disable brake hold for 30 min by pressing the M button while in neutral. Handy when going through the car wash.

 

[BLoflin]

You can come close to a on/off button for Brake Hold, by defining the User editable soft button on the bottom of the screen to be "Driver Assistance". The Brake Hold is the top entry on that screen. So two quick button pushes to turn off or on.

P.S. Besides Brake Hold I find Driver Assistance defined to that quick access button the best for me, as with trailering and stuff sometimes some of the other functions (like Reverse Brake Assistance) I want to temporarily turn off.

Finally my trick for creeping up with Brake Hold active, is just to move gear shift up to N and then back to D quickly. As it takes a second of two of your foot on the brake to activate it when going back to D. But I didn't know the trick about using M button, that was posted above, so I'll try that next time!

 

[jamill]

I would love to use mine, but I have a company truck that’s a 2020 Ram 2500 which doesn’t have it. I was too afraid I’d get used to it in mine, that I’d space out and roll in to someone in the company truck. ?

 

[RossRR]

My wife's 2020 Escape Hybrid has it and she loves it. Every time I drive her car, first thing I do is disable it. Fortunately it is controlled by a button on her console. Once I receive my ordered truck, I don't anticipate brake hold every being enabled.

 

[oneinch]

Just curious, those of you who don't trust AUTO HOLD, I suppose you don't trust the adaptive cruise control to stop and hold your truck either. It uses the same system.

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