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It's not your braking system (the hydraulic part), but simply a matter of the switch. This switch really isn't any part of that brake system, but merely sits on a metal frame above your brake pedal, and is activated by the movement of the pedal's "arm". As that arm moves away from the switch, it closes the circuit that energizes the stop lamps, but in your case it has to move farther away than it should before the circuit is closed.
I, too, have noticed that on my two '93s, it takes more movement of the pedal to activate the brake lights than on my earlier 240s (e.g., an '84). Unfortunately, on my several earlier cars, the switch was more accessible, whereas on my '93s, it's really hard to get to.
I don't know how it is on your '91, but if it's accessible to you, you need to adjust the position of the switch so that it sits farther away. That way, a lesser amount of movement of the arm will trigger the lights.
Honestly, I don't remember the exact configuration of the switch -- I can barely get a glimpse of it on my '93s. On earlier cars, I remember that I can adjust a nut to move the switch -- it may or may not be the same on these later 240s, and you may need to use a spacer instead. If so, get a variety of thicknesses so that you can select the right one: remember that you don't want the lights to come on too easily (e.g., a bumpy road might jigger the brake pedal enough to cause the lights to come on falsely and too often), but on the other hand you want the lights to turn on as soon as you deliberately step on the pedal so that you give the driver behind the earliest warning.
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