The one on the master cylinder is the brake light switch. The one on the brake pedal is for the automatic transmission, assuming that the car is automatic.
It is threaded into the master cylinder. If you can't reach from under, remove the fuel tank to expose the master cylinder and brake light switch.
In a Classic Beetle, it's screwed into the master cylinder. New Beetles will have it in the vicinity of the brake pedal lever.
They are located on the brake master cylinder. Vw joe. Have a great day
The brake switch is located on the brake master cylinder!
on side of master cylinder.
That is a pressure controlled brake light switch, when you step on the brake pedal and develop pressure in the brake fluid the brake lights are switched on.
At the end of the master cylinder. Probably the easiest way to gain accesss would be to remove the gas tank.
The brake light switch is threaded into the master cylinder. Open the hood, look at the brake master cylinder, notice the brake light switch with wires connected. Have new one ready to install when you remove the old one to keep loss of brake fluid to a minimum.
will be attached to the brake pedal where the master cylinder rod is
If you want to know if you can leave the brake switch out of the master cylinder the answer is no, it will leak. If you can plug the hole with something that does not protrude into the housing to seal it the MC should still work, you just won't have any brake lights. Be aware though the Master Cylinder creates a large amount of pressure when you step on brake pedal so you need to screw something into it or it will just blow out or leak. You can use an electric micro switch on the pedal itself like the modern cars do to keep the brake lights. If you want to know if the MC will still work if keep the switch in it then yes, but again you won't have brake lights with a bad switch without using something else.
Above the brake pedal where the master cylinder is attached to the brake pedal assembly.
Mounted somewhere on the brake pedal lever, or possibly a pressure switch on the master cylinder, depending on the vehicle.