Guys please remember you are driving a Landcruiser, it is a $80k vehicle when it comes to parts replacement and repair, not a Corolla or Camry. Parts doesn't get cheaper as the truck age. As for the brake booster going bad, I think it is not too bad, replace every 150-200k miles/ 15 years...
Cost of everything is high now, everyone wants to have higher pay naturally cost pass down to consumer.
DIY and shop is two different ball games. For a professional shop that do it right, it takes time and passion. The biggest thing is liability/ lawsuit. To do it properly, there is no way to...