Line Lock on Rear Drums

My system....

OK, guys just to tell you that I use two solenoid in my braking system conected in series in the way that into the car I have a push button and a swicht, when the swicht is at one side it only locked the front brakes (for burning) and then I change the side of the swicht and the (same) push button using the other solenoid lock the four wheels...Works excellent...
 
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