High Speed Off Road Brake "Failures" - aka Ice Mode

Don't really want to read 2 pages of responses, but first impression based on the statement made of the the pedal not vibrating and not moving at all makes me think master cylinder/pedal problem? I'm confused on the pedal feel when this happens tho. Literally rock hard or soft to the floor? Or a bit in between?

 

Pedal is rock solid as though there’s no vacuum in the booster. And release and reapply on the pedal gets the same solid pedal feel for several seconds. I’m not stabbing the pedal on initial application either.

I’ve been trying figure out if I’m coming off a stretch of WOT where the engine may not produce vacuum for a short period, but the booster should still have enough vacuum unless it has a leak. But I’ve tested the pedal after the truck is shut off for a couple hours and I still have boost without turning it on (the pedal goes to the floor without the engine on) so I don’t think it’s leaking.

I’m leaning pretty heavily towards the pribability that we’re just going outside the bounds of what the abs can handle.

I do the same brake drag technique in the track car before a hard braking corner. Just to avoid pad knock back and make sure I have booster pressure. Keeps me from shitting my pants.

I can’t really do that on the trail though because I’m usually running trails I’ve never been on so I can’t predict an obstacle far enough in advance. Usually it’s a couple seconds before impact and I just need to drop anchor immediately. All four locked up on the Tundra would be a dream come true.

 

But why is it not happening on Gen2. Less sophisticated ABS? I have never had my brakes do that. If it was the ABS system then it should do it for everyone the same. I know Dragos has missed turns before and taken out some vegetation but I don't think it was the brakes. It was most likely coming into a corner to hot. #shouldhaveboughtaraptor .

 

Yeah I now think the abs systems (code) are different between gen2 and 3.

I know about 7 3rd gens now who have seen this but no 2nd gens.

 

Hmm. Not sure but I think you’re just fubar’d. Mental note made to give you plenty of distance should a Baja excursion come to fruition...

 

On my 2nd Gen i had enough close calls and obstacles smashed into, I just pulled the ABS fuse. 4wd still works perfect, but it does disable the "limited slip" function. Also kills stability control and traction control. I've never looked back and haven't had any more close calls because of my safety systems.

And i can lock all 4 tires.

 

I have had it happen in both my 10 and 14 tundras. Same spot interestingly enough when I come off hard surface road on to washed out gravel/dirt while in a corner. I always just figured it was the abs not being able to keep up with my crazy driving

 

I've had it happen. But It's extremely rare, maybe only 3 times in the 5 years I have had The Truck. Usually happens when I mash the brake on very loose surface. 99% of the time I can panic stop without any problems.

WTF man!? You have selective hearing??? I have already told you several times that I have had it happen.

Dude! you are the first 2nd gen I have heard from who has said this works. Which EXACT fuse did you pull?? I heard there were two different ABS fuses and I also heard you lose 4wd and go into limp mode. Also, what year is your truck? they made some significant changes mid-way through the cycle.

 

So that’s both good and bad news right? Bad news is it’s happened to you. Good news is pulling ABS fuse makes it go away.

And yeah. All the other sustems that use the ABS will not work. That’s fine by me, I prefer an analog truck anyway. One thing I would like to try is a switch where I can cut or return power to the fuse from inside the truck. There are times on the trial I’d like to have A-Trac on in 4lo for climbing obstacles. I imagine it will require the truck be turned off and back in though so the abs can do it’s startup test.

I don’t believe you.





I remember you saying it happened to you, but I thought you said you could back off the pedal and reapply. I definitely can’t do that. It stays rock solid for several seconds.

 

hmm. i think i remember hacking my FJ to be able to do that. not sure if it would be the same on the tundra but let me dig a little and see what i can remember.

 

Yeah I'd like a switch too but then I'm lazy. If you do one with a writeup, I would probably do it haha.

And yeah, I remember not being able to modulate the pedal, like even lifting off the brake completely would not return the brake option. Usually it would happen in sand whoops.

 

What exact fuse did you pull?

 

Red 50A one that's pulled up.

 

I keep it in one of my door cubbies in case i feel like restoring it at any time on the road. Which I never have. I miss it zero.

 

The ABS, traction control, and parking brake light stay on but i just live with it.

 

I am gonna pull my fuse next weekend to test it out. Putting a switch on it would be simple

 

Thx homie! I appreciate it

 

@KevinK said he was gonna do it last month

 

can't believe a thing that asshat says...

 

He was probably drunk and forgot he even said it.

 

more than likely

 

I actually like the nannies. I never disable them. VSC has saved me on the trail more times than I can count and 4hi A-TRAC works well in 90% of the situations I encounter.

 

Ive had this happen a few times on my other 2010 tundra. 100% pucker moments.

 

I wonder if a call or email to some desert truck companies like camburg, down south, TC, sdhq would be worth it. They build some sick trucks and work them hard. Maybe they know of this?

 

I was out Saturday night with SDHQ which kinda prompted this thread. They hit the same situation in their Tundra while I was in the passenger seat. I offered to pay the cleaning bill for the seat I was sitting in.

I'd for sure be interested in hearing others' solutions. At this point I'm planning to put a relay inline with the ABS1 fuse and control it with a momentary switch. ABS should be active every time you start the truck for safety. If I want to disable it, press the momentary switch to kill ABS, and when the truck turns off, the relay returns to closed so ABS is active the next time the truck turns on.

I don't want someone to end up driving our truck without ABS by accident. Myself included.

 

How bout you pull the damn fuse first and test it??

 

But then he's gonna have to come up with some other plan to dream/talk about for several weeks before actually doing anything about.