The brake light switch, which is activated by the brake pedal, is properly adjusted when the brake light comes on just before braking takes effect.
The brake light switch is part of the brake override system. Improper adjustment may prevent the brake override system from working properly.
If necessary, adjust the brake light switch.
Hold the brake light switch in place.
Turn the adjusting nut in direction (a) to make the brake light come on earlier.
Turn the adjusting nut in direction (b) to make the brake light come on later.