I just changed the brake master cyllinder and now my brake lights are on.
I have not put the wooden board back in place where the brake and cluch pedals are.

Anyone know where the sensor is for the brakes?

My new MC only had one spade but I believe this is for a pressure loss and not the lights.

Any help here?

On the pushrod for the master from the brake pedal there is a round metal disk that activates / deactivates the brake lite switch (mounted on the pedal assembly).

You do not have the arm of the brake light switch on the correct side of the disk so the lights are continually on.

yep. the switch arm must be on the rear of the disc. adj the piston rod free play, p110 haynes. also you may have to adj the the switch as well, p129 haynes.

k