everytime i press the brakes (moving or not)"R"(reverse)lights turn on-dashboard on 1991 Lexus LS400

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like i said everytime i press the brakes light turn on and delay of stopping like a 1sec delay... i knw its the transmission but b4 i take it to the dealer or mechanic i just wanna knw what is the ecxact problem... thanks...
(2) Answers
The wires at the trunk hinge on the driver side break and create this kind of problem: The R light and increase in RPM is one. Another one is the R light stays on and the car won't shift out of the first gear. All there is to do is Bridge the trunk wires with a wire that has needle on each ends to find which one are broken and replace them or bridge them with a second wire with a double wire lock connector. It is an easy repair, nothing to worry about. Avoid putting the car for that in a shop, because they could end up telling you that your brakes are worn or in the second and worth case that your transmission is bad.
All this to prove that a PhD in Literature is not synonym with manual limitations.

Unless someone has experienced the exact same problem in the exact same manner then it will have to be diagnosed by a qualified tech. That's like saying before you go to a doctor with your ailment you want someone on the internet or phone to tell you what is your medical problem. Cannot see or test thru phone lines or internet.