Rear brake upgrade on a 1988 5K CST to 20V vented rotors: Is it worth it for city driving?

[Brett Goetz]

I'm considering an upgrade of my rear brakes from the standard solid
rear discs to calipers and vented rotors from the 1990 20V or V8 and a
master cylinder from an Avant.  I don't race, I really don't even drive
very fast, but I have never been happy the way this car's brakes have
performed.  My main goal is to stay out of someone else's trunk during
rush hour or avoid cars that pull out in front of me. I have replaced
the pads, flushed the fluid and replaced the master cylinder.  I have
decent stopping power, but not as good as other cars I've had.  Thanks
in advance for the input.

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