Are you looking to perfect your burnouts or improve your drag strip launch times? If you've heard the term "Line Lock" but aren't sure exactly how it works, you're in the right place. In this guide, we'll break down the definition, usage, and proper operation of a brake line lock system.
What is a Line Lock? (Definition)
A line lock is a specialized solenoid device that allows the front brakes to lock independently of the rear brakes via an electric switch. Essentially, it controls a valve that isolates the fluid pressure, giving the driver individual control over the brake zones.
This setup allows the front brakes to remain fully locked while the rear brakes are released, enabling the driver to spin the rear wheels freely. This prevents "wasting" the rear brake pads and rotors during a burnout. It is a common modification for drag racing enthusiasts and those who participate in burnout competitions.
Common Usage & Techniques
1. Traditional Burnouts
Line locks are most commonly used for heating up tires before a drag race. By fully locking the front wheels and engaging the gas pedal (while disengaging the clutch), the rear tires spin while the car remains stationary.
2. Rolling Burnouts
Although less common, experienced drivers can achieve "rolling burnouts" with a modified line lock setup. By proportionally increasing front brake pressure and throttle, the car maintains a steady low speed while the rear tires slip and spin faster than the front tires.
3. Rear Line Locks (Drifting & Control)
Line locks can also be installed on the rear brake lines. When activated, this prevents fluid pressure from reaching the rear calipers, allowing the rear wheels to spin freely while the front brakes are controlled by the pedal. This technique is often used in drifting exhibitions or for show, allowing the driver to "creep" at varying speeds while maintaining a burnout.
Can a Line Lock be used as a Parking Brake?
A hydraulic line lock can be used as a temporary parking brake on steep terrain for off-road vehicles. However, there are significant safety concerns:
⚠️ IMPORTANT SAFETY WARNING:
Line locks should ONLY be used temporarily. Hydraulic systems naturally bleed down pressure over time, and seals can leak. Never rely on a line lock as a permanent parking brake, especially on hills, as the brakes will eventually release and the vehicle may roll.
How to Use a Line Lock: Step-by-Step Guide
Performing a burnout requires coordination. Here is the basic operation process for a standard front-brake line lock setup:
- Prime the Brakes: Press the brake pedal firmly to build pressure.
- Engage the Solenoid: Press and hold the line lock switch (button).
- Release the Pedal: Take your foot off the brake pedal. (The front brakes remain locked due to the solenoid, but the rear brakes release).
- Burnout: While still holding the switch, apply the accelerator (and release the clutch if manual) to spin the rear tires.
- Launch: Release the switch button. The front brakes will instantly release, allowing the car to launch forward down the track.
