Public Service Announcement: I saw many Toyotas

[Racer X]

"On top of that, there has been an identified issue with a number of Toyota models where the power brake booster does not develop full braking power when the engine is at wide open throttle. Toyota engines are not the only ones with that as an issue as well, it happens in other car makers models too:

YES! WOT usually has the LEAST intake vacuum signal, and vacuum is what most power brake boosters work off of. Many diesels have electric vacuum pumps, and Buick (among others) used power steering pump pressure for brake assist.