Brake Failure!!!!

It is not, but there are a lot of electronic controls involved with the OR braking system. The braking at the rear drums actually is entirely electro-hydraulic actuated but the braking at the front is a direct hydraulic connection to the master cylinder. The electronic controls intervene for the brake assist, braking distribution, ABS, traction control, etc. functions. The brake boost is a hydraulic boost system.

 

The brake boost is electronic not vacuum assist on the ORs and Pros. Obviously still done via hydraulics to the actual brakes but the additional pressure is generated by an electronic boost.

 

A simple check of diagnostic codes with techstream will tell you what has failed. Sounds like you've lost boost and therefore you must apply the entirety of the effort with your foot. You'll know this on the diagnostics if you have a particular solenoid failure, pump/motor failure, or no accumulator pressure.

 

No it's not, the additional effort is supplied by hydraulics. It is HYDRAULIC BOOST. Meaning fluid pressurized by a pump and stored with an accumulator is used to amplify your braking effort at the master cylinder. If it's electronic boost it would need an electronic actuator and there is not one there.

It's not called a hydraulic brake booster for nothing.

 

And without the electronic boost pump to pressurize your hydraulic fluid you don't have boosted brakes.

 

So you call a hydraulic actuator an electronic actuator since the fluid it uses is pressurized by an electric motor running a pump?

 

Not really what I said. The brake boost is only effective via electronic aid, therefore it is an electronic brake boost. The brakes are still hydraulically actuated but without the electronic boost they really don't work.

 

That was for Tacoma models with the Traditional Vacuum Brake Booster, not the Off Road or Pro.

 

I know what you're saying...

How would you make the distinction between electrically powered and steering pump powered "hydraulic boost"?

To me, it should be what's powering it.
Vacuum boost-vaccuum
Hydro boost-steering pump
Electric boost-electric pump

 

@Paps

By any chance do you have the Overland Equipped fuse block bracket installed? It sounds similar to @Mr.Pink Taco

https://overlandequipped.com/collec...-block-bracket-for-3rd-gen-toyota-tacoma-2016

More on the failure here. With warning light pictures here.

 

I can attest to the brakes not working very well at all with the electricity cut to the electric booster pump. The truck becomes totally undrivable. You can only come to a full stop using your hand brake. The hydraulics need the pressure from the electric booster pump to safely work.

 

HOLY FUCK DUDE!!! THIS IS IT!

 

That sounds super sketchy, good thing everyone is ok man.

 

The distinction is what is actually doing the work, i.e. what is the actuator. Both cases you mention are hydraulic boost systems because hydraulic force is applying the "boosted" portion of the effort. What runs the pump to pressurize the fluid or what is the control signal is a description of the system but doesn't change that they're fundamentally hydraulic boost systems.

An electrical boost system would use an electrical actuator or motor to directly do the work. There are true electrical steering assist systems now as opposed to hydraulic power steering assist systems and these use electric motor actuators to amplify steering effort making them true electrical boost.

 

This is it meaning you have that same bracket and the wire is cut? Or just the same symptoms/lights.

 

Do you know @Mr.Pink Taco ? I messaged him (just a few ago so not expecting a reply already) trying to figure out how he fixed his issue.

 

same bracket, same wire cut.

 

trying to find a fix. Hopefully it's a simple wire fix and not major damage to a computer or such.

 

You should contact the owners of the company, and let them know. They sent an email PSA letting owners know about this issue on July 14th, 2020 (attached). @Mr.Pink Taco is somewhat active on here. He should chime in.

I personally protected the wire with a rubber fuel line. This thread makes me want to go check it out. GL!

 

The electronic aid is only useful with battery voltage, which is only useful with a charge from the alternator, which is only useful with a running internal combustion engine, which is only possible with gasoline. Therefore, the brake system is gas boost.

Toyota literally describes it as a hydraulic brake booster.