How do you bleed the brakes and or master cylinder on a 1974 super beetle?

Get the Bentley service manuel for your year car as it has a lot of info you will need later on also.

Well I believe after '70 or '71 on standard Beetles and all the Supers have a "duel" master cylinder system. The front brakes are isolated from the rears. If you lose the fluid from the front system you will still have the rear brakes available and visa versa. Either way, just go to the farthest wheel and bleed that one first. Right rear and then left rear. Right front then left front. Just bleed BOTH the front wheels before doing BOTH rears on a "duel" system. Get a clear plastic tube the same size as the bleeder screw head on the wheel and just have a helper step on the brake pedal as you open the screw slightly and then close the screw BEFORE the helper releases the pedal. The Master Cylinder creates a slight vacuum when you release the pedal so it will suck air back into the system again.

Make sure the reservoir stays full or you'll have to do it all over again for that system.