maybe i was a little vague before but i have an 87 gn and had two problems occur on the same day first was my tranny would not down shift on its own when i came to a stop . had to manaully go thru gears and overdrive seems really delayed about 70mph. i had these exact symptoms 7 yrs ago and it was tcc sol. that fixed it . so this time i replaced sol again and same problem still and on that same test drive i lost power to the brakes , no power assist hard pedal brake light on all the time. so i tested 12v to pump motor and pressure sw. on top of p.m. i have power fuses ok . i depressurized motor and tested ign motor on time really long 15 secs roughly . but i dont think its bad . i was leaning more towards brake switch maybe misadj or bad or not enough volts . can a brake switch going bad for a while destroy or impede the power master and is this why my tcc sol. is not working correcly too ? has anyone trb. shooted this electrically before ? any wiring diagrams available? also none of these parts in question are older than 5 yrs less than 3oo0 miles . also would the vss sensor have anything to do with trans problem