Master switch - The main reasons for the master window switch to stop working are dirt, dust, spilt drinks, cigarette ash etc, which fall in past the switch buttons and contaminate the internal electrical contacts. Once the contacts become dirty, current draw is increased through the switch, which in turn fatigues and snaps the internal springs of the switch, and the switch no longer works. These switches are not serviceable. If you do get a new one, make sure you keep it clean.
Window wind-up - The front windup windows of VR's and the like, use many rubbers to seal against water. These rubbers move, either up or down, and can restrict the operation or ease of movement of the windows. These rubbers are available new, and when installed, they should be glued in place.
RH Front rubber - Part Number 92047144 (rear edge of glass)
RH Front rubber - Part Number 92046805 (front edge of glass)
LH Front rubber - Part Number 92046429 (rear edge of glass)
LH Front rubber - Part Number 92046805 (front edge of glass)
Window regulators - Standard front window regulators are a pressed steel scissor design, but do wear out. Wear is evident if the window tilts forward while being wound up. The regulators can be adjusted by a slide located behind the door trim, but adjustment is limited. Tight or worn bailey channel (window) rubbers can inhibit the windows movement and place excessive stress on the regulator.
Window rubbers - VR door window rubbers are renowned for sliding from their original position. The front doors suffer most from this, with the front rubbers sliding up and the rear rubbers sliding down. This leads to leaking windows, loose windows, tight window operation, or very loose window operation. The rubbers can be moved and correctly positioned, but if left for to long the rubbers can be damaged and distorted. New rubbers are available from Holden dealers.