Ha, don't feel bad as I started a thread pretty early on as I almost sh!t myself the first time it happened in the rain on a dark 6 lane road. The funny thing is I was able to actually get my truck to skid leaving rubber on the pavement which is shouldn't do.

Now, that could be because I changed the tires to a different tire or it's simply the ABS system over reacting. Which is what I personally think. It frequently happens to me near my office when I have to stop for the red light on rutted pavement caused by semi-truck traffic.

Last week I installed new new tires which are heavier then my previous tires and that has made a bit of a difference. I plan to panic stop at the exact intersection on my way home to see if things change with the new tires. Either way I will post up my observations.

ps I can tell you the nose dive changed significantly after I removed the XREAS suspension and installed the TRD Suspension.

Here is my old thread and if you search there are a couple more threads you can read about it.

Brake Assist - Panic Stop (Tire Pressure)
Brake Assist - Panic Stop (Tire Pressure)

Unfortunately it doesn't work that way off-road. When you're on loose sand/gravel/whatever, there are times when you need it to dig in when you hit the brakes, and the ABS doesn't let it.

Sounds like air in the brake lines or possibly a bad master cylinder but sounds more like air to me.

You could certainly have an electronic issue, whether software or hardware - that would cause the ABS to cut brake pressure and have no brake function. The ABS does exactly that when it's activated. If the solenoid response time or latency in some part of the ecu or signal were having issues, it would result in no brake pressure at the caliper and no brakes as a result.

Totally agree / get that. Although I haven't had the opportunity yet to try crawl control mode / speed and the terrain select options I'm thinking ( in this particular model ) that using these options the software will lock whatever wheel it needs to in order to keep the vehicle on track / pitch / yaw whatever you're doing. I suppose disabling ABS is more for the highly experienced off roader - I know the Jeep guys simply pull a fuse or relay under the hood which kills it all ( but would probably disable everything else on my vehicle with it ).

Hell I installed an after market gas cap when I got the truck ( quality unit, locking cap ). Within a drive cycle the damn cpu killed everything on a restart, dash lit up every option possible. Drove perfectly fine otherwise LoL. So I guess you can do it that way! Toyota Tech asked me two questions when I dropped in to have it scanned, what kind of gas is it running and is the oem gas cap still on it? its more than the idiot lights on, everything goes into disable mode. So uhh, yeah - we cleared it through the OBDII port and put the stock cap back on

@evtmille , any update?

Something doesn't add up here...

2015 TRD Pro
7 posts

So far he's had the following defects:
2015 (new car)
Vehicle won't rev when gas is pressed. Multiple CEL including Throttle Body.
Dealer says there is no issue? No follow up?

2017 (8k miles)
Brakes went to floor (Hydraulic/mechanical failure.
Brakes locked up (No ABS, electrical failure)
Dealer says there is no issue? No follow up?

Well there’s any interesting summary.
In high school I worked in a service dept at a Chrysler dealership. I remember there was this lady that would her green Sebring convertible in at least weekly for various complaints from engine shutter to brakes to whatever. And nothing could ever be duplicated. Maybe it’s a driver brain processing failure.

Did you ever figure out what was wrong? I have a 2020 TRD Off Road all stock and a very similar issue happened to both me and my wife in the car 3 times. Pedal randomly went to the floor, no braking, then started working again. Luckily we did not hit anything. Dealer says the car recorded the emergency braking system going off all 3 times, but that usually has lights and alarms going off which did not happen. Pretty concerning!

My 2020 4Runner is in the shop now with this same exact issue. Very concerned and not sure what to expect out of this. Motor blows up and worst happens is I am stuck and need of a lift. Worst case scenario with failure on brakes?

I would immediately call Toyota customer service and request to escalate your problem and file a case. I ended up escalating with Toyota Corporate and they were apparently able to eventually duplicate the issue. According to the dealer, they can not pin point the issue, but are replacing the entire braking system and are sending the old parts to japan to further investigate. I agree it is very concerning. Hope that helps with your situation.

Been studying what I just bought. 2021 Limited.
Lots of info here.
Of course lots of not

Sorry for this lane post but trying to get unlocked, so I can ask my questions.
New here and new to 4Runner.
On #7 now. Looks like impossible to meet and greet everyone.
8more posts to go.
wish me luck.

They were able to duplicate. Let see where this goes....

If they figure out what your issue was, please let us know!

I will thanks!