Complete Brake Failure

I doubt it is the master, since the brakes worked fine after the fact. This is probably electronically related. The brake lines pass through an ABS pump that can cut pressure from the pedal to the brake calipers. The crawl control system also has the ability to modulate the ABS pump.

I would ask that they replace the ABS pump, Crawl control unit to give me a small piece of mind.

The master cylinder/brake caliper/brake lines work by hydraulic modulation -- if something was wrong with those items, it would remained in a failed state. The only 'interference' electronic component is the ABS pump and the crawl control system (to my knowledge) Even if the vacuum boost unit failed, it would make the brake pedal very_very stiff and hard to stop, but the brakes would still work.

This is just my 2 cents. I am not a Toyota tech.

 

I believe the car has dual systems the front and rear would have to fail . I know if I brake hard on my 2012 FJ( that star control or what ever they call it ) if I hit a bump it feels like I have no brakes for a millisecond and scares the shit out of me. But putting the car in the garage , was it cold and you had that tranny surge? Good luck I know after all that unintentional acceleration that started all the way back with the Audi 5000 and then with the Toyota Prius I don't believe anything was ever found . The Audi was the pedal placement for heal toe driving meaning the gas was close to the brake and people hit the gas. The Prius I think was blamed on car matts. Mac

 

Take the truck to an empty parking lot and try to replicate the problem as best you can. Pretend you're slowly pulling into your garage just as if you were actually doing it, including pulling into your driveway or whatever you did when it happened.

 

well... that's terrifying

 

I saw that post if it is the same one I am thinking of. He said his brakes were locking up causing him to spin out.

 

Was this an off road as well?

 

Yes and if it was the modulation then the pedal would remain firm and not go to the floor.

 

The engine revved slightly which is normal while I pull into the garage working the brake to get close enough to the work bench so the door will close. I am ready for that. This was seconds that I didn't have brakes. I had both feet with the paddle to the floor. There was no two footing the gas and brake. I had the peddle down the whole time while I grabbed the parking brake and shifted into park. The brakes came back after that and felt like nothing ever happened.

 

Not sure. I "think" so

 

OK, not to pry. But did the brake pedal actually lose all pressure and hit the floor?

I reallize hitting the brake pedal and not having the vehicle stop is terrifying, but did the pedal really lose all pressure?

I only ask because in modern brake systems, that seems virtually impossible to happen. When you press the brakes is the hydraulic fluid gets passed through the ABS pump, then directly to the calipers. If there was a malfunction on the ABS pump, the fluid would still need to go somewhere--the pedal would most likely be stiff, or you'd have a pool of brake fluid in your garage floor. Like someone mentioned, there are backup circuits. If there are no leaks in the system, the fluid HAS to go somewhere for the pedal to just drop to the floor like that.

 

That guys last stated that he thought his truck was wrecked and repaired by the dealership before he bought it. He hasn't been back since then

 

I would be getting rid of that thing in a heartbeat. no way no how would I get behind the wheel of something that doesn't brake when I push the brakes. that's just absurdly scary.

 

Was the truck still idling after you came to a stop?

 

Let's not mix these two threads and clump them together. That dude's post was strange, and the behavior was completely different. To be honest, his thread reeks of buyer's remorse and using any leverage he can get to have Toyota take the truck back.

 

Big bubble in the hydraulic lines?

 

Somebody asked about that so I shared the most recent info on that situation

 

Yes it loss all pressure. It was not ABS modulation. I agree that it should be impossible but I have not sat down to look how the brake system works with the crawl control. The peddle was bottomed out. Didn't think it could have that much travel. I have been racking my brain, replaying it over and over. Trying to think through a normall braking system and how this could possibly happen. I love my truck and the 2016s.
As for prying you are all good. I would be questioning this as well. I do have a general under standing of brake systems. I used to get to play with and work on a Prolite and a PRO2 in the Torc series until the Team owner and I had a falling out. New job doesn't give me enough vacation to join another team even through I still get the phone calls from time to time.

 

Engine never died or stalled.

 

Possible but if there was that much air trapped in the system I would think the fluid would be low.

 

did you repeatedly try and mash the brake or just have time to mash down once and freak out before pulling the e brake?