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Line locks do not create pressure. They hold pressure. They are nothing more than a solenoid valve. You hit the brakes, then hit the button, then let off the brake pedal, they will hold whatever brake pressure you had when you hit the button.
No you do not have to install a line lock to the front brakes. Line locks are normally installed for the front brakes for manual cars.
On automatics you have the option to install them on the rear brakes. When doing this you hit the button before applying the brakes, blocking the pressure to the rear brakes. It makes for a real nice free spinning burnout.
Why would you want to do it this way? Example: On an automatic without line lock you are powerbraking doing your burnout. You have a foot on each pedal doing your normal burn-out. Now add a line lock to the front brakes. You are now on the gas operating the front brakes with a switch. During this burnout the switch, wiring, or line lock fails. The car lurches forward as it gets traction. Can you get on the brakes before you hit the kid that walked out to ask the guy running the lights a question, someone in the lane trying to take a picture of a car going down the track, the track official that just walked out to wipe up some oil off the track at the lights, or maybe the car and driver that is asleep at the lights. Now with the line lock on the rear brakes. You have a foot on both the brake and the gas while doing your power brake. During this powerbrake the swith, wiring, or line lock fails. Your powerbrake is cut short that's all.
Benifits of installing a line lock: Less wear and tear on the rear brakes. Better launches since the rear brakes are cool and not glazed from fighting the burnout. Lower tranny temps. Less stress on the drivetrain.
On another note. When you did the the rear brakes did you adjust the partking brake cable? If it is too tight it could create enough drag to make it hard to do a burnout.
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Woody McGuire
1987 Buick Regal T-Type
13.2 @ 101 on 16psi (Stock Turbo/Stock Injectors)
1991 Eagle Talon TSI
AWD 5-Speed (Complete basket case)
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