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That's one of my pet peeves...people calling the PARKING brake an EMERGENCY brake. To my way of thinking, down shifting is a more effective and more "natural" way of slowing a vehicle. I've had lots of emergencies in my life and not a one of them was solved by pulling that handle!
Yup, it's a PARKING brake, not an emergency brake. I know a new driver who flipped their car because they pulled the 'emergency' brake when they began losing control of the car. The car began fishtailing, they yanked the 'emergency' brake and the car immediately went into a snap oversteer, went off the road sideways and ended up on the roof.
I always use the parking brake when parking, but I must admit there was one instance when I did use it in an emergency. I was driving an old VW Golf that had rust damage from Michigan winter salt. The back half of the exhaust system with the muffler fell off and on the way off, it ruptured one of the steel brake tubing lines.
Stepping on the brake pedal sent it right to the floor. Amazingly, there was still 'some' residual braking. Only ruptured one of the two lines (most cars have two lines that go to front right, rear left and FL, RR), but I would estimate it at no more than 15% of normal braking right in the last 1/2" of the pedal travel above the floor (distances would be more than 5 times longer than normal).
I used the parking brake (in a straight line) as an auxiliary brake to help slow and stop the car. This however, was on a comparably light little car at ~35-40mph. Whether the parking brake would have had much effect on a 5000+lbs SUV is debatable.
Having been in amateur rallying, I've also used the parking brake for drifting/turning on loose surfaces to combat understeer.
Max