Hurst Line Lock Installation Overview
The Hurst Line Lock, also known as Roll Control, is a device that allows you to lock the front brakes while releasing the rear. This is useful for burnouts and staging at the track. Installation involves mounting the solenoid, plumbing brake lines, and wiring.
Understanding the Hurst Line Lock System
The Hurst Line Lock system is essentially a solenoid-operated valve that, when activated, traps brake fluid pressure to the front wheels. This action effectively locks the front brakes while allowing the rear wheels to spin freely. This system is designed to be used when the vehicle is stationary, and it is crucial to understand this limitation to prevent accidents. The system uses the existing brake system of the vehicle, and the Hurst Roll Control kit supplements it with the valve and necessary electrical components. The primary function is to enable controlled burnouts at the drag strip, allowing for tire warm-up. The system is not designed for use as a parking brake or for hill starts. The understanding of the principles of hydraulics and electrical systems is necessary to achieve correct installation and operation, and all safety measures should be followed when installing and using the line lock.
Components of the Hurst Roll Control Kit
The Hurst Roll Control kit typically includes several key components to facilitate installation and operation. The core component is the waterproof, epoxy-molded electrical solenoid valve. This valve is responsible for controlling the flow of brake fluid to the front brakes. The kit also contains a snap-action switch, which is used to activate the solenoid. An indicator light is provided to show when the line lock is engaged, preventing accidental application or disengagement. A 4-amp fuse is included for circuit protection, ensuring the electrical components are protected from overload. The kit also comes with the necessary mounting screws for securing the solenoid in the engine compartment. Additionally, the kit includes brake line adapters and fittings. Some vehicle-specific kits may also include pre-made brake lines and other custom components. Depending on the vehicle, you might require additional parts, such as union fittings to adapt to the original brake lines, specifically in cases where the ABS module has different-sized fittings.
Installation Steps
The installation process involves three main steps. First, the solenoid must be securely mounted. Then, the brake lines are plumbed, including adapting to existing fittings. Finally, the electrical connections are made to activate the system.
Mounting the Solenoid
The Hurst Roll Control solenoid should be mounted in a location that is both accessible and secure, often on the firewall or another stable part of the chassis; The chosen location must allow for the solenoid to be firmly attached, preventing any flexing of the brake lines which could lead to failures. It’s crucial to ensure the mounting surface is clean and free of debris before securing the solenoid with the provided screws. Consider the routing of the brake lines and electrical connections when selecting the mounting position. The solenoid, with its pipe threads, will need adapter fittings to connect to AN lines if necessary, and these threads should be sealed using Teflon tape or paste to prevent leaks. A sturdy and well-thought-out mounting position is essential for the correct operation and longevity of the line lock system. Make sure that the solenoid is not in direct contact with heat from the engine and that the lines are not constricted or bent.
Plumbing the Brake Lines
Plumbing the brake lines for a Hurst Line Lock involves carefully connecting the solenoid to the existing brake system. The Hurst solenoid typically uses 3/16″ tubing and fittings, while some vehicles, like Mustangs, may have 10mm fittings on the ABS module. This requires using adapters to convert between these sizes. The typical method involves tapping into the front brake line, ensuring that the Hurst brake line is threaded into the OEM front brake line and adapter. It is important to not fully tighten fittings initially, to allow for minor adjustments. The lines should be routed in a way that avoids sharp bends, chafing, or contact with hot engine components. Proper sealing of all connections with Teflon tape or paste is crucial to prevent leaks. The system is designed so that the brake fluid can be trapped by the solenoid when activated, isolating the front brakes for a burnout. Confirm all connections are secure before moving to the next step in installation.
Electrical Connections
The electrical connections for a Hurst Line Lock are relatively straightforward, but require care to ensure proper functionality and safety. The kit typically includes a waterproof solenoid, a snap-action switch, an indicator light, and a fuse. The solenoid needs a power source, and it’s common to use a 12V power supply from the vehicle’s electrical system. The activation switch is wired in line to control the flow of power to the solenoid. An indicator light should also be connected, often in parallel with the solenoid, to signal when the line lock is engaged. The fuse is critical to protect the system from overloads. Some installers prefer to use a factory fog lamp switch for activation. Use proper wiring techniques, such as soldering or crimping, to ensure a reliable connection. It’s crucial to avoid exposing wiring to areas where it can be pinched or damaged. Pay close attention to the instructions included with the specific Hurst kit for exact wiring.
Specific Vehicle Considerations
Vehicle-specific kits, like those for Mustangs, often require adapters for the ABS module’s 10mm fittings. Some installers bypass the ABS and connect directly to the master cylinder. Careful attention to the instructions is essential for proper installation.
Mustang ABS System Integration
Integrating a Hurst Line Lock with a Mustang’s ABS system requires careful attention to the brake line connections. The Hurst solenoid typically uses 3/16-inch tubing and fittings, while the ABS module often has 10mm fittings. Mustang-specific kits are designed to address this discrepancy, providing necessary adapters to transition between the two sizes. These kits commonly include unions and fittings that facilitate a smooth and secure connection; The general approach is to convert the 10mm fittings on the ABS to 3/16 inch for use with the Hurst system. Some installations involve running new brake lines from the master cylinder to the line lock, then connecting to the ABS module. It’s crucial to follow the kit’s instructions meticulously, ensuring all fittings are properly tightened and sealed to prevent leaks. Incorrect connections can lead to braking issues and compromise the vehicle’s safety. Therefore, a good understanding of the brake system and careful execution are necessary for successful integration. It is often recommended to take pictures before disconnecting any lines to ensure the proper reconnection.
Master Cylinder Connections
When installing a Hurst Line Lock, the connections to the master cylinder are critical for proper function and safety. Some installers choose to plumb the line lock directly off the master cylinder rather than the ABS module. This approach may simplify the installation process for some vehicles, and avoids the need for adapting to the ABS unit’s fitting size. It usually involves disconnecting the front brake line from the master cylinder and routing it through the Hurst solenoid. The Hurst instructions may guide you to use a specific port on the master cylinder. In some cases, a T-fitting might be required for proper integration. It’s crucial to ensure all connections are tight and leak-free when connecting to the master cylinder, as any leak will result in brake failure. It is also important to ensure you use the correct size fittings and ensure they are compatible with the master cylinder. Always refer to the specific kit instructions and vehicle service manual for the best practices for your vehicle. When working with brake lines, cleanliness is paramount, and avoid introducing any debris into the system. After you complete the connections to the master cylinder, the system needs to be properly bled to remove air.
Post-Installation Procedures
After installing the Hurst Line Lock, bleeding the brakes is essential to remove air. Then, thoroughly test the line lock system in a safe environment to ensure proper functionality and confirm that the front brakes lock effectively.
Bleeding the Brakes
Following the Hurst Line Lock installation, bleeding the brakes is a critical step to ensure optimal braking performance. Air trapped in the brake lines can lead to a spongy pedal feel and reduced braking effectiveness. Begin by ensuring the master cylinder is full with the correct brake fluid. You’ll need an assistant for this process. Start at the brake caliper furthest from the master cylinder and work your way closer. Attach a clear hose to the bleeder valve and submerge the other end in a container with some brake fluid. Have your assistant slowly depress the brake pedal while you open the bleeder valve. Observe the fluid and repeat this process until no air bubbles are visible. Close the bleeder valve before your assistant releases the pedal. Repeat this for each brake caliper, checking the master cylinder fluid level frequently. The bleeding procedure is crucial, and if done improperly, it can compromise the safety of the braking system.
Testing the Line Lock
After the installation and bleeding process, it’s crucial to thoroughly test the Hurst Line Lock for proper functionality. Begin by ensuring the vehicle is on a level surface and the parking brake is engaged. With the engine running, depress the brake pedal firmly and activate the line lock switch. You should feel the brake pedal remain firm as the front brakes are held by the solenoid. Carefully release the brake pedal while maintaining the switch activation. The front wheels should remain locked, and you should be able to feel the rear wheels are free to move. If the front wheels do not lock or if the brake pedal feels spongy, recheck your connections and bleeding process. Deactivate the line lock switch, and the brake pedal should return to normal. Perform several tests to confirm the line lock engages and disengages reliably. It is essential to test the line lock in a safe and controlled environment before using it in more demanding situations, such as at the track. If any issues arise, it’s critical to troubleshoot and correct them before use.