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Line lock
A line lock is a device that allows the front brakes to lock independently of the rear brakes via a switch.〔(), Installing a Brake Line-Lock.〕〔(), What is a line lock.〕〔(), Installing a Line lock.〕〔(), Line-lock systems.〕〔(), additional text.〕 The device is an electric solenoid that controls a valve which is placed on the front brake line, and is controlled by a switch.〔〔〔〔 Simpler systems consist of a manually operated valve which directly opens and closes the brake line, usually with a lever or tap inside the cabin of the vehicle. Normally, the valve is open and allows fluid to pass through to the front brakes.〔〔 However, when the brakes are applied and the solenoid is activated, the valve closes to trap the brake fluid, keeping the front brakes applied until the switch is released.〔〔〔〔
==History==
Drag racing is a motorsport often run using cars with manual transmissions. Manual transmissions allow drivers to control the amount of power transferred from the engine to the wheels by manipulating both clutch and throttle inputs, allowing vehicles to accelerate quickly without losing traction. However, launching a vehicle requires simultaneous gas pedal and clutch pedal inputs, preventing drivers from manipulating the brakes with their feet. Without brake input, drivers staging their vehicle at the starting line would roll if the clutch was slightly engaged. If the driver's vehicle rolled across the staging line before the start of a drag race, driver would "red light" and lose that race.〔 The line lock prevents vehicles from rolling by allowing the driver to control the clutch and accelerator using foot input and braking with the hand. In an automatic transmission vehicle, a line lock allows the engine to rev up to its peak power RPM and launch aggressively from the starting line.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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