does the UPER radiator hose get hot ? IF IT DOESNT YOU COULD HAVE A BAD THERMOSTAT, BROKEN WATER PUMP OR CLOGGED RADIATOR
AND IF IT DOES GET HOT, THE MOST PROBABLE THING IS THAT YOUR RADIATOR CAP IS NOT WORKING LIKE IT SHOULD, INSPECT THE GASKETS OF THE CAP THAT GO INTO THE RADIATOR.
Do you have 4 discs (rotor) or drums in the back?
I had some problems with my brakes 97 gst after rolling for a while they would`nt work like they should, so i installed cross drilled rotors and had no more issues the problem was that they heat up very fast