Join Date: Apr 2004
Location: Cape Cod, Massachusetts
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Re: Master Warning Light
Just my guess and that's you might be developing a slight leak in your hydraulic brake accumulator. As it starts to lose pressure you would get the light which will go off as soon as the electric hydraulic pump "kicks in."
Not to worry because a complete failure of either the accumulator or electric pump will give you a "steady" light. "Book" then says, "pull over" to side of road and call Toyota.
There are "Two" warning lights in the system. One for the pump failure, and the other for the accumulator, so with only one, you could drive safely home or to the dealer.