The Great Pumpkin - '71 Duster

Because it's blocking the rear brakes from applying rather than holding the fronts. When you pull into the water box, you apply the solenoid and hold the car with the brake pedal instead of pumping 3-4 times while relying on the solenoid to keep the pressure up.

It's basically the same as having it in front but you have a little more control with the pedal as opposed to having the fronts being locked. Probably best to have it on a toggle switch with a light so you don't forget to turn it off before you leave the line.

Suppose I could have put the solenoid on the inner fender apron by the master cylinder but since it's in the rear line it didn't make sense. It's pretty cluttered around that area already.

Besides, to plumb it in the front brakes (with the Wilwood valve thing) the main front line has to come out of the master cylinder port and go right to the solenoid. Then, it goes back to the front brake port (on the valve) and then out from the two outlet ports on the bottom of the valve to the left and right sides. Just seemed like a plumbing nightmare to me because everything is in close proximity already.

Make sense?