Hurst Line Lock Instructions: A Comprehensive Guide
This guide details the installation of Hurst Roll Control brake systems, focusing on solenoid mounting, brake line plumbing, and electrical connections for optimal performance.
Understanding Hurst Line Locks
Hurst Line Locks are vital components for vehicle control, particularly in drag racing and performance driving scenarios. They temporarily lock the front brakes, allowing for maximum engine power to be directed towards the rear wheels during burnout procedures. This prevents unwanted forward movement and facilitates optimal tire heating for enhanced traction.
These systems consist of a solenoid valve installed within the front brake lines, controlled by an electrical switch. When activated, the solenoid restricts fluid flow to the front brakes, effectively locking them. Understanding the function of each component – the solenoid, switch, and associated wiring – is crucial for successful installation and operation. Proper installation ensures safe and reliable performance, enhancing your vehicle’s capabilities on and off the track.
What is a Line Lock and Why Use One?
A Line Lock is a hydraulic locking mechanism installed in the front brake lines of a vehicle. Its primary function is to hold the front wheels stationary while the rear wheels spin freely. This is exceptionally useful for performing burnouts, a crucial step in drag racing to heat and clean the rear tires, maximizing traction at the starting line.
Using a Line Lock eliminates the need to continuously apply pressure to the brake pedal during a burnout, reducing driver fatigue and ensuring consistent results. It also prevents potential damage to the brake system caused by prolonged pedal pressure. Beyond drag racing, Line Locks can be beneficial for controlled vehicle maneuvers requiring independent rear wheel spin. Properly installed, a Line Lock significantly enhances performance and control.
Safety Precautions Before Installation
Prior to installing a Hurst Line Lock, disconnect the negative battery cable to prevent accidental electrical shorts during wiring. Always work in a well-ventilated area, wearing appropriate safety glasses and gloves. Ensure the vehicle is securely supported on jack stands – never work under a vehicle supported only by a jack.
Brake fluid is corrosive; avoid contact with skin and eyes. If contact occurs, flush immediately with water. Be mindful of hot exhaust components and moving engine parts. Double-check all fittings and connections for tightness after installation and bleeding the brakes. Improper installation can compromise braking performance, leading to accidents. If unsure about any step, consult a qualified mechanic.
Installation Process: Step-by-Step
Begin by locating the ideal solenoid mounting spot and preparing the brake lines for disconnection, ensuring a smooth and efficient installation process.
Step 1: Identifying Mounting Locations
Carefully identify suitable locations for the solenoid and the connection point on the master cylinder’s front brake line within the engine compartment. Prioritize accessibility for both mounting and future maintenance. The solenoid should be positioned securely, away from extreme heat sources like the exhaust manifold, to prevent damage to the unit or brake fluid.
Ensure the chosen location allows for proper brake line routing without kinking or excessive strain. Consider the space needed for the solenoid’s physical dimensions and any necessary brackets or adapters. Locate the front brake line leading from the master cylinder; this is where the Hurst line lock will be integrated. Double-check for clearance with other engine components before finalizing the mounting position. A stable and accessible location is crucial for a successful installation.
Step 2: Solenoid Mounting – Drilling and Attachment
Once the mounting location is confirmed, carefully drill the necessary mounting holes, ensuring they align perfectly with the solenoid’s mounting points. Use a drill bit appropriate for the material of the chassis or bracket. Deburr the drilled holes to remove any sharp edges that could damage the solenoid or mounting hardware.
Attach the solenoid securely using appropriate bolts, washers, and nuts. Employ lock washers to prevent loosening due to vibration. Ensure the solenoid is firmly fastened and doesn’t wobble. Verify that the mounting doesn’t interfere with the brake line connection. Tighten the hardware to the manufacturer’s specified torque to avoid over-tightening and potential damage. A robust and stable mounting is essential for reliable operation.
Step 3: Brake Line Disconnection and Preparation
Before plumbing the new brake lines, carefully disconnect the existing front brake line at the master cylinder. Have a container ready to catch any spilled brake fluid, as it’s corrosive and damaging to paint. Clean the fitting on the master cylinder thoroughly to remove any dirt or debris.
Prepare the new brake line assembly by ensuring the fittings are clean and free of damage. Inspect the lines for any kinks or bends that could restrict fluid flow. Gently bend the lines as needed to achieve the desired routing, avoiding sharp angles. Proper preparation minimizes the risk of leaks and ensures a smooth, efficient brake system operation. Remember to use line wrenches to prevent rounding off the fittings.
Plumbing the Brake Lines
Connecting the Hurst Roll Control system involves careful brake line routing, utilizing appropriate fittings, and considering brake line size for optimal functionality.
Connecting to the Master Cylinder
Establishing a secure connection to the master cylinder is paramount during Hurst Line Lock installation. Carefully identify the front brake line originating from the master cylinder; this is the target for integration with the Hurst system. Disconnect the existing line, ensuring minimal fluid loss and preventing air from entering the brake system.
The Hurst kit typically includes a specialized fitting designed to interface directly with the master cylinder outlet. Thread this fitting onto the master cylinder port, tightening it securely but avoiding over-tightening, which could damage the threads. Ensure the fitting is properly seated to prevent leaks.
Once the adapter is in place, connect the new Hurst brake line to this fitting. Double-check all connections for tightness and proper alignment before proceeding. Proper connection here ensures efficient brake fluid flow and reliable line lock operation.
Using Appropriate Fittings
Selecting and utilizing the correct fittings is crucial for a leak-free and reliable Hurst Line Lock installation. The Hurst Roll Control system requires specific fittings to ensure compatibility with existing brake lines and the new line lock components. Typically, these include tube nuts, eyelets, and adapters designed for brake line applications.
Always use fittings rated for brake fluid and capable of withstanding the pressures within the hydraulic system. Avoid mixing different types of fittings (e.g., steel and brass) as this can lead to corrosion and eventual failure. Ensure each fitting is properly tightened, but avoid over-tightening, which can strip threads or damage the line.
Refer to the Hurst installation manual for the precise fitting sizes and types required for your specific vehicle and brake line configuration. Using the wrong fittings can compromise safety and performance.
Brake Line Size Considerations
Maintaining the correct brake line size is paramount for proper hydraulic function and braking performance with a Hurst Line Lock system. The size of the new brake line, particularly the tube nut, directly determines compatibility with the existing brake system components. Incorrect sizing can lead to reduced braking efficiency or even system failure.
Generally, it’s vital to match the original equipment manufacturer (OEM) brake line size. Most Hurst installations utilize ¼ inch brake lines, but verification is essential. The size of the tube nut dictates the appropriate new line to connect to the left front brake. Always double-check specifications before purchasing any replacement lines or fittings.
Using undersized lines can restrict fluid flow, while oversized lines may not seal correctly. Prioritize matching the OEM size for optimal safety and performance.
Electrical Wiring and Connections
Proper electrical connections are crucial for the Hurst Line Lock’s functionality, involving solenoid wiring, terminals, and switch setup for reliable operation.
Wiring the Solenoid
Connecting the solenoid correctly is paramount for the Hurst Line Lock to function as intended. Begin by identifying the solenoid’s wiring terminals, typically requiring a 12-volt power source and a ground connection. Utilize the wiring diagram included with your Hurst Roll Control kit as a definitive guide, ensuring accurate polarity.
Employ 18-gauge wire for a secure and reliable connection, capable of handling the solenoid’s current draw. Carefully route the wiring away from hot exhaust components and moving parts to prevent damage or shorts. Consider using a fuse inline with the power wire for added safety, protecting the system from potential electrical overloads. Double-check all connections before proceeding to the next step, verifying a solid and consistent electrical path.
Using Butt Connectors and Terminals
For secure and lasting electrical connections, employing quality butt connectors and terminals is crucial during Hurst Line Lock installation. Crimp-style butt connectors provide a robust joint between wires, resisting vibration and corrosion. Ensure the wire gauge matches the connector size for a proper fit, preventing loose connections.
Utilize a reliable crimping tool designed for automotive applications, guaranteeing a solid mechanical bond. Before crimping, strip the insulation from the wires carefully, avoiding nicking the conductors. After crimping, gently tug on each wire to verify the connection’s integrity. For terminal connections, use appropriately sized ring or spade terminals, securing them firmly to the solenoid and switch.
Switch Installation and Setup
Proper switch installation is vital for convenient and safe Hurst Line Lock operation. Select a mounting location accessible to the driver, yet protected from accidental activation. Many enthusiasts opt for dashboard or console placements. Ensure the switch is securely fastened, preventing movement during vehicle operation.
Connect the switch wiring according to the Hurst instructions, typically involving a power source, a ground, and a signal wire to the solenoid. Consider using a switch kit designed for roll control systems, offering an aesthetically pleasing setup and enhanced safety features. For added security, incorporate a fuse into the power circuit, protecting against electrical shorts.
Final Checks and Adjustments
Post-installation, thoroughly bleed the brakes and meticulously test the line lock’s functionality, addressing any issues promptly for reliable performance and safety.
Bleeding the Brakes After Installation
After completing the Hurst Line Lock installation and plumbing, bleeding the brake system is absolutely crucial to remove any air introduced during the process. Begin by ensuring the master cylinder is filled with fresh brake fluid. Have a partner assist by repeatedly pressing and releasing the brake pedal while you open and close the bleeder screws at each caliper, starting with the furthest from the master cylinder.
Observe the brake fluid flow, looking for air bubbles. Continue bleeding each caliper until clear, bubble-free fluid emerges. Proper bleeding ensures firm pedal feel and optimal braking performance. If the system proves difficult to bleed, consider using a vacuum bleeder or pressure bleeder for more effective results. Always double-check all fittings for leaks after bleeding is complete, and top off the master cylinder fluid level as needed. A properly bled system is vital for safety!
Testing the Line Lock Functionality
Once the installation and bleeding are complete, carefully test the Hurst Line Lock’s functionality in a safe, controlled environment. With the vehicle stationary, activate the line lock switch; you should feel the brakes engage on the front wheels, preventing rolling. Ensure the rear brakes remain free to allow for steering control.
Slowly and cautiously attempt to move the vehicle forward to confirm the line lock is holding. Verify the switch operates smoothly and reliably. Repeat the test several times. Important: Never engage the line lock at high speeds or for extended periods, as this can cause brake overheating and potential damage. Always prioritize safety during testing and familiarize yourself with the system’s operation before use. Double-check all connections before each use.
Troubleshooting Common Issues
If the line lock fails to engage, first check the electrical connections and the solenoid wiring. Verify the switch is functioning correctly and that power is reaching the solenoid. A common issue is a loose connection or a blown fuse. If the brakes aren’t holding, air may be present in the lines – re-bleed the system thoroughly.
Another potential problem is an incorrectly sized brake line fitting, leading to leaks. Inspect all fittings for tightness and proper sealing. If overheating occurs, ensure the line lock isn’t engaged for prolonged periods. Finally, confirm compatibility with your vehicle’s braking system, especially if equipped with ABS or a split brake system. Consult the Hurst documentation for specific troubleshooting steps and diagrams.
Compatibility and Considerations
Hurst line locks require careful consideration for vehicles with ABS or split brake systems, demanding proper installation methods for safe and effective operation.
Vehicles with Anti-Lock Braking Systems (ABS)
Installing a Hurst Line Lock on vehicles equipped with Anti-lock Braking Systems (ABS) necessitates a nuanced approach to avoid compromising the ABS functionality. Direct interference with ABS sensors or the ABS module is strictly prohibited, as it can trigger warning lights and potentially disable the entire system. The line lock should be installed after the ABS module in the brake line, ensuring the ABS system maintains control over wheel speed sensing and modulation.
Carefully identify the ABS module’s location and the corresponding brake lines. Proper plumbing is crucial; utilize appropriate fittings and brake line materials compatible with ABS systems. Incorrect installation can lead to reduced braking performance or ABS malfunction. Always consult the vehicle’s service manual for specific ABS system layouts and recommendations before commencing installation. Prioritize safety and system integrity when working with ABS-equipped vehicles.
Split Brake System Compatibility
Hurst Line Locks are generally compatible with vehicles featuring split brake systems, however, careful consideration must be given to the system’s configuration. A split brake system divides the hydraulic circuit, typically separating front and rear brakes, enhancing safety in case of a line failure. When installing a line lock, it’s vital to install it on the appropriate circuit – usually the front brake line – to maintain the intended functionality of the split system.
Ensure the line lock doesn’t inadvertently combine the split circuits, as this would defeat the safety feature. Proper identification of the brake lines is paramount. The size of the tube nut determines the size of the new line needed for correct installation. Always verify compatibility with the vehicle’s specific split brake system design before proceeding, and consult the vehicle’s service manual for guidance.
Recommended Installation Methods
For a secure and reliable installation of your Hurst Roll Control brake line and line lock, threading the appropriate fitting directly into the master cylinder’s front brake line is highly recommended. Prior to installation, carefully identify the solenoid mounting location within the engine compartment, alongside the master cylinder line. Utilize 18-gauge wire with male terminals and butt connectors for all electrical connections, ensuring a robust and dependable circuit.
When drilling mounting holes for the solenoid, exercise caution to avoid damaging existing vehicle components. Employ a two-wrench method when tightening fittings to prevent line twisting. After plumbing and wiring, thoroughly bleed the brakes to eliminate air bubbles and guarantee optimal braking performance. Always double-check all connections before testing the line lock’s functionality.
