Brake pedal glitch

I remember an argument of semantics about this a bit ago. IDR what the conclusion was haha.

 

Wouldnt car care nut know what he's talking about . He is like a shaman of Toyotas lmao he knows his shit for sure

 

I would disagree with him entirely. A vacuum boosted system and a electrically boosted system are both hydraulic boosted brakes. The off-road system use a electric pump to provide the additional pressure whereas all the rest use conventional vacuum boost. Regardless of the Symantec’s the system existed long before crawl control, that is just an added bit of functionality using computer programming.

 

I disagree with him too as there is no additional hydraulic source feeding the booster, the accumulator on the side just holds pressure.

 

I think @Jeff Lange had some beta last time.

 

I know ours isn't boosted by the power steering, was saying my mustang is but it's the same idea.

What do you think the accumulator is accumulating? The electric motor is attached to a pump to create the pressure for the assist. It uses brake fluid instead of a separate hydraulic fluid source. But the fluid is actually providing the assist.

Toyota calls it a hydraulic booster...

 

The terminology generally revolves around what is providing the actual boosting effect. You could have a vacuum booster that used an electric vacuum pump to provide the vacuum for example, but the booster itself would still be a vacuum booster.

There are vacuum boosters, there are electric boosters, and there are hydraulic boosters, and there are a number of varieties of each, such as using a mechanically-driven hydraulic pump (like the Mustang mentioned previously), or an electrically-driven hydraulic pump (like the Tacoma uses).

For another comparison, you can look at Toyota's EHPS (electric hydraulic power steering) system that was used in the MR2 versus the EPS (electric power steering) systems used in most new vehicles. EHPS uses an electric motor to pump power steering fluid, used in a hydraulic power steering system. EPS uses an electric motor directly attached to the steering system. One is hydraulic, one is electric.

Electric boosters use an electric motor to directly apply force to the braking system, and it is not something I can remember Toyota ever using, but these systems do exist.

The Tacoma uses a vacuum booster or a hydraulic booster. It does not use an electric booster. The hydraulic booster is electronically operated, but it is not an electric booster. A similar analogy would be calling the engine an electric motor simply because it is electronically controlled and uses a battery to start it.

They're really not. A vacuum boosted system uses vacuum to assist (apply additional force) to the hydraulic braking system. It is not a hydraulic boosting system. Ditto for an electrically boosted system. The Tacoma's hydraulic booster is a hydraulic booster for a separate(ish) hydraulic braking system.

This is true, Toyota has been using their hydraulic braking system for about 25 years, and it is used in many vehicles (including the Tacoma since the 2005 model year) without Crawl Control. Crawl Control was first used in 2009.

Long story short: it's a hydraulic booster that uses electricity, it is not an electric booster, that's a very different thing.

EDIT: These are the internals of an electric booster, you can see the electric motor geared to the pushrod shaft, applying assistive force directly to the master cylinder. This is not how the Toyota system works.


Jeff

 

Alright brake nerds, calm down. One thing we can all agree on is OP's problems are normal and are due to the unique feel of the Electrically boosted hydraulic booster that uses electricity causing the unusual feedback in the peddle.

OP be like: