Hi Sewin,
So when you start the car the pedal drops with the Servo assistance upon starting. So I expect that rules out the Servo?
If you hold the brake pedal down on a slope it will creep forward until it hits the floor!
Will jack the car up later and check the rear wheels but the drums are not any hotter than my 96 +4 and are equal both sides about 20 degrees after a drive.
Many thanks
Will