I don't post here anymore, but wanted to after reading this:
Also, the key is to slow down subtely by using your emergency brake "slightly". That way your front end doesn't dip down and your brake lights don't show.
I highly suggest that no one take this "advice". The chance of locking your rear wheels while messing around with your parking brake is too great. If you start playing with your rear brakes at freeway speeds to the extent that you slow your car fast enough to make a bit of difference with the cop on the radar or laser, and you accidentally lock them up even for a second at 100+ feet per second, there is a good chance you will be well and truly screwed.
What happens when you lock your rear brakes but not your fronts? THE REAR END SLIDES OUT AND YOU TURN 180 DEGREES LIKE JIM ROCKFORD! Then what happens when you panic and release the rear brakes while you're halfway into your spin at 70mph? Your tires grab and you get rolling friction again and shoot across the median into the minivan carrying a family of 6 and your dumb ass is on the news being charged with manslaughter because it's easy for the crash investigator to tell by the 2 crossed skids you left on the roadway what you did.
If you have to figure this out for yourself instead of taking my word for it, do it in a wet vacant parking lot and not on the road with me or my family around.
Your rear brakes provide about 10-20% of your stopping power depending on whether they're adjusted properly and they're often not. In order to slow the car in any meaningful way at 80mph, even "subtely", you're going to have to apply way more force to your parking brake lever or pedal than is anywhere near safe. Don't be a *******. Stay off your parking brake while your car is in motion.
And this:
Change out the portioning valve in the brake systen so you can elect to use the rear brakes for the slow down rather than the front disc brakes. It causes much less nose dive and isn't as apparent to the cop.
Yeah, go ahead and screw around with the braking system on your car and see what it gets you after a serious crash when the retired engineer/expert witnesses go over your braking system. What's a "portioning" valve anyway? Are you maybe thinking of a PROportioning valve?
I've done a lot of traffic stops and I've never had to rely on brake lights going on to tell me if I had the right car with a laser or radar unit. Radar detectors are good at helping to ensure the other guy gets the ticket and not you, as long as you're not the obvious leader of the pack. With instant-on radar and laser, if you're driving out front of the pack and you're speeding, chances are, you're it.
Don't be an idiot and try to beat the RADAR or LIDAR by messing around with your parking brake at 80mph.