Hurst Line Lock

Elevating Your Drag Racing Game One Smoky Burnout at a Time

The smell of burning rubber, the billowing clouds of smoke, and the screech of tires against asphalt—few things excite automotive enthusiasts quite like a perfect burnout. Behind many of these impressive displays is a small but mighty device known as a line lock. Today, we’re diving deep into one of the most respected names in the industry: the Hurst Line Lock.

Whether you’re a seasoned drag racer looking to shave precious milliseconds off your time or a weekend warrior wanting to add some excitement to your ride, understanding the ins and outs of a Hurst Line Lock is essential. This seemingly simple device can transform your racing experience, provide consistent launches, and yes, help you create those head-turning burnouts that make spectators whip out their phones in awe.

But what exactly is this mysterious device, how does it work, and is it right for your vehicle? Buckle up as we take you on a comprehensive journey through everything you need to know about the Hurst Line Lock.

What Is a Hurst Line Lock, and How Does It Work?

At its core, a Hurst Line Lock is a hydraulic control device that selectively locks your front brakes while leaving your rear brakes free, allowing you to perform controlled burnouts to heat up your tires before a drag race. This seemingly simple functionality is actually a game-changer for serious racers.

The system works by interrupting the hydraulic pressure to your rear brakes while maintaining pressure to the front brakes. When activated, the solenoid valve in the Line Lock traps hydraulic pressure in the front brake lines, effectively keeping your front wheels firmly planted while allowing your rear wheels to spin freely when you apply throttle.

Think of it as having an extra set of hands that can hold down your brake pedal partially for you. With a Hurst Line Lock, you can focus on modulating the throttle to achieve the perfect burnout without worrying about your car creeping forward or having to balance brake and gas pedals in a precarious dance.

Unlike mechanical solutions like using your parking brake (which we’ll discuss later), a Hurst Line Lock provides consistent, reliable performance without wear and tear on your parking brake mechanism. The electric solenoid can maintain exact pressure regardless of how long you need to spin those tires.

The Installation Process: Getting Your Hurst Line Lock Up and Running

Installing a Hurst Line Lock might seem intimidating at first glance, but with the right tools and a bit of patience, it’s a project most mechanically inclined enthusiasts can tackle in a weekend.

Tools You’ll Need

Before diving in, gather these essential tools:

• Wrenches (various sizes)
• Screwdrivers (flathead and Phillips)
• Wire cutters/strippers
• Crimping tool
• Electrical tape
• Brake fluid
• Brake bleeding kit
• Jack and jack stands
• Safety glasses
• Shop towels

The Installation Process

1. Preparation: Start by finding a clean, well-lit workspace. Elevate your vehicle securely on jack stands and remove the wheels for better access to the brake lines.
2. Locate the Mounting Position: The solenoid should be mounted securely to the vehicle’s frame or firewall, away from excessive heat sources like exhaust components. It should also be positioned between the master cylinder and the front brake calipers.
3. Brake Line Installation: This is where precision matters. You’ll need to cut into your front brake lines and install the solenoid in-line. Make sure to have plenty of brake fluid on hand, as you’ll need to bleed the system afterward.
4. Electrical Wiring: The Hurst Line Lock requires a 12V power source. You’ll need to run wires from the solenoid to a toggle switch installed within reach of the driver. Many racers mount this switch on or near the steering wheel for easy access during staging.
5. Activation Button Installation: Mount the momentary switch that activates the Line Lock in a location that’s comfortable for you during burnouts—typically on the steering wheel or shift knob.
6. System Bleeding: After installation, thoroughly bleed the brake system to remove any air bubbles. This step is crucial for proper operation and safety.
7. Testing: Before taking your vehicle to the track, test the Line Lock in a controlled environment. Apply the brakes, activate the Line Lock, and then release the brake pedal. The front wheels should remain locked while the rear wheels can spin freely when throttle is applied.

For beginners, the wiring aspect often causes the most concern. The basic wiring setup involves connecting the solenoid to both a power source (with an inline fuse for protection) and a ground. The activation button gets wired in-line with the power lead, creating a simple circuit that energizes the solenoid when pressed.

The Benefits of Running a Hurst Line Lock

Why would you want to invest in and install a Hurst Line Lock? The benefits extend well beyond just looking cool at the track.

1. Consistent Tire Preparation

For drag racers, tire temperature and traction are everything. A proper burnout heats the rubber to the optimal temperature for maximum grip off the line. The Hurst Line Lock allows you to perform consistent burnouts every time, ensuring your tires are perfectly prepped for each run.

2. Improved Launch Control

A good launch can make or break your quarter-mile time. By allowing you to build RPM while keeping the car stationary, the Line Lock helps you hit the perfect launch RPM without creeping through the staging lights.

3. Reduced Wear on Your Parking Brake

Using your parking brake for burnouts puts tremendous stress on components not designed for that purpose. The Line Lock takes this strain off your parking brake mechanism, potentially saving you from costly repairs down the road.

4. Enhanced Driver Control and Focus

During staging and preparation for a race, the last thing you need is to juggle multiple controls. The Line Lock simplifies your pre-race routine, allowing you to focus on other critical aspects of your launch.

5. Competitive Edge

In racing, every advantage matters. The consistent launches provided by a properly installed and utilized Hurst Line Lock can shave precious time off your runs, potentially making the difference between winning and losing.

The Legality Question: Can You Use a Hurst Line Lock on the Street?

This is where we need to address a significant consideration: legality. Is the Hurst Line Lock legal for street use? The answer is nuanced and depends largely on your location.

In most jurisdictions, line locks fall into a gray area. They’re not explicitly illegal in many places, but they modify your vehicle’s braking system, which could potentially run afoul of vehicle safety regulations. Additionally, using a Line Lock to perform burnouts on public roads is almost universally illegal under reckless driving or exhibition of speed laws.

The practical answer most enthusiasts settle on is this: Hurst Line Locks are designed primarily as competition devices intended for use at the drag strip or race track, not on public streets. While having one installed isn’t necessarily illegal in itself, using it inappropriately on public roads certainly can be.

If street legality is a concern, consult with local automotive regulations or a knowledgeable automotive attorney before installation. Many enthusiasts choose to install a hidden switch or removable components to ensure their vehicle remains compliant during inspections.

Compatibility: Can Any Vehicle Use a Hurst Line Lock?

While Hurst Line Locks are versatile, they’re not universally compatible with every vehicle. Here are some considerations:

Brake System Type

Line locks work with traditional hydraulic brake systems. Vehicles with advanced electronic brake systems, brake-by-wire technology, or integrated stability control systems may present compatibility challenges or require additional modifications.

Front/Rear Split Brake Systems

The standard Line Lock installation requires a separate front and rear brake circuit. Most modern vehicles have this configuration, but some older or specialty vehicles might have diagonal split systems that complicate installation.

Manual vs. Automatic Transmissions

Line Locks can be installed on both manual and automatic transmission vehicles, though the technique for using them varies slightly. Automatic transmission vehicles often benefit more from Line Locks since holding the brake while modulating throttle can be challenging with only two feet.

Vehicle Weight and Power

While not a technical limitation, practical performance varies based on your vehicle’s power-to-weight ratio. A Line Lock on an underpowered vehicle may not provide enough benefit to justify the installation.

The Investment: Costs and Where to Purchase

The cost of a Hurst Line Lock system typically ranges from $80 to $200 for the basic kit, depending on the specific model and included components. More comprehensive kits with additional features like adjustable pressure settings or digital controls can run higher.

Beyond the cost of the kit itself, factor in these potential additional expenses:

• Professional installation if you’re not comfortable doing it yourself ($100-300)
• Additional brake lines or fittings if needed ($20-50)
• Quality switches if you prefer upgrades over included components ($10-30)
• Brake fluid for system bleeding ($10-20)

As for where to purchase, Hurst Line Locks are widely available through:

• Automotive performance retailers both online and brick-and-mortar
• Major auto parts chains with performance departments
• Specialty drag racing equipment suppliers
• Direct from Hurst’s official distributors
• Online marketplaces (though beware of counterfeits)

When purchasing, look for authentic Hurst branding and packaging. The performance world unfortunately sees its share of counterfeit products that may look similar but lack the quality and safety testing of genuine Hurst components.

Real-World Performance: What Users Are Saying

Customer reviews for Hurst Line Locks tend to be overwhelmingly positive among the racing community. Users consistently praise:

• Build quality and durability
• Consistent performance under racing conditions
• Ease of installation compared to competitor products
• Reliability over long periods of use
• Responsive customer support when needed

Common criticisms tend to center around:

• Limited instructions for first-time installers
• Occasional issues with solenoid longevity in extreme applications
• Higher price point compared to generic alternatives

One consistent theme in reviews is that the Hurst Line Lock pays for itself in improved consistency and performance at the track. Racers report gaining confidence in their launches and seeing measurable improvements in their reaction times and 60-foot times after installation and practice.

Line Lock vs. Parking Brake: Why the Upgrade Matters

Some might wonder why they should invest in a Line Lock when their car already has a parking brake that can hold the front wheels while allowing the rears to spin. The differences are significant and worth understanding.

Precision and Consistency

A parking brake is a mechanical device with varying tension depending on how hard you pull or push it. A Line Lock, by contrast, provides exactly the same hydraulic pressure every time it’s activated, resulting in consistent performance.

Safety Factors

Parking brakes aren’t designed for the heat and stress of repeated burnouts. Using your parking brake for this purpose can lead to premature failure—potentially at a dangerous moment. Line Locks are specifically engineered for this application.

Brake System Wear

Parking brakes operate using cables that can stretch, fray, or snap under the extreme conditions of a burnout. The hydraulic pressure of a Line Lock distributes force more evenly and works with your vehicle’s designed braking system rather than against it.

Control Considerations

With a parking brake, you’re often stuck with binary operation—it’s either engaged or disengaged. A Line Lock allows for more nuanced control, including the option to modulate pressure in more advanced setups.

Troubleshooting Common Hurst Line Lock Issues

Even the best systems occasionally encounter problems. Here are some common issues and their solutions:

Issue: Front Wheels Still Rotate During Burnout

• Check for air in the brake lines; bleed the system thoroughly
• Verify the solenoid is receiving full voltage when activated
• Inspect brake lines for leaks or compromised fittings
• Ensure the solenoid is installed in the correct direction (note flow arrows)

Issue: System Won’t Hold Pressure When Released

• Examine the solenoid for internal leakage (may require replacement)
• Check all brake line connections for security
• Verify the button is functioning correctly with a multimeter
• Look for damaged brake lines that might be leaking pressure

Issue: Intermittent Operation

• Inspect all electrical connections for loose wires
• Check ground connection quality
• Test power source for consistent voltage
• Examine the activation switch for wear or damage

Issue: Excessive Pedal Travel After Installation

• Re-bleed the entire brake system
• Check for proper brake fluid level
• Verify all fittings are tight and secure
• Inspect for expanded or bulging brake lines

Most issues with Line Locks stem from either improper bleeding of the brake system or electrical connection problems. Taking your time during installation and being methodical about these aspects can prevent the vast majority of potential problems.

Testing Your Hurst Line Lock: Ensuring Proper Function

After installation, properly testing your Line Lock is crucial before relying on it at the track. Here’s a methodical approach:

1. Static Testing: With the engine off, press the brake pedal firmly, then activate the Line Lock. Release the brake pedal slowly—you should feel resistance as the Line Lock maintains pressure.
2. Pressure Check: With the Line Lock engaged, the brake pedal should remain firm. If it sinks to the floor, you likely have air in the system or a leak.
3. Controlled Dynamic Test: In a safe, private area (never on public roads), engage the Line Lock, apply gentle throttle, and verify the front wheels remain locked while the rears spin freely.
4. Full System Check: During your controlled test, monitor for any unusual noises, fluid leaks, or inconsistent behavior.
5. Brake Function Verification: After disengaging the Line Lock, ensure your normal brake function returns completely. Both front and rear brakes should operate normally.

Remember that proper testing is not just about performance but about safety. A malfunctioning Line Lock could lead to unpredictable braking behavior, so thorough testing is non-negotiable.

Warranty and Support: What to Expect

Hurst Line Locks typically come with a one-year limited warranty against manufacturing defects. This warranty generally covers the solenoid and related components but may not cover damage resulting from improper installation or use.

The warranty typically does not cover:

• Damage from misuse or abuse
• Improper installation issues
• Normal wear and tear
• Modifications to the original components
• Damage from racing (ironically, given their purpose)

For warranty service, most users report a straightforward process requiring proof of purchase and return of the defective component. Hurst has maintained a solid reputation for honoring legitimate warranty claims, though like any company, experiences can vary.

Beyond the warranty period, Hurst offers technical support for their products, and their customer service is generally well-regarded in the racing community. Many users report receiving helpful troubleshooting assistance even for installations that are several years old.

What’s in the Box: The Hurst Line Lock Kit Components

When you purchase a standard Hurst Line Lock kit, you can expect to receive:

• The solenoid valve (the heart of the system)
• Mounting hardware for securing the solenoid
• Activation button/switch
• Basic wiring harness
• Inline fuse holder
• Installation instructions
• Warranty information

What’s notably missing and typically needs to be purchased separately:

• Additional brake line as needed for your specific vehicle
• Brake line fittings (these vary by vehicle)
• Brake fluid
• Electrical tape or heat shrink tubing for wire connections
• Any custom switches if you prefer something different than included

Some premium kits include additional components like adjustable pressure regulators, digital controllers, or quick-disconnect fittings, but these features come at a higher price point.

Comparing Hurst to the Competition

The line lock market has several players, so how does the Hurst system stack up against alternatives?

Hurst vs. Budget Alternatives

Compared to generic or budget line locks, Hurst offers:

• Superior build quality and materials
• More consistent solenoid performance
• Better sealing against brake fluid leaks
• Longer operational lifespan
• More reliable electrical components

The tradeoff is primarily price, with Hurst commanding a premium over lesser-known brands.

Hurst vs. Premium Competitors

Against other premium brands like Biondo or MSD:

• Hurst offers excellent value while maintaining quality
• Some competitors offer more specialized features for specific racing applications
• Hurst tends to have better availability and broader distribution
• The warranty and support are comparable across premium brands

Most racers report that Hurst hits the sweet spot between quality and cost, making it a favorite for serious enthusiasts who aren’t sponsored professional racers.

The Beginner Question: Is Installation Truly DIY-Friendly?

Can a beginner really install a Hurst Line Lock? The honest answer is: it depends on your mechanical aptitude and willingness to learn.

The installation involves:

• Basic automotive electrical work (connecting switches and power)
• Working with brake hydraulics (cutting lines, flaring ends, installing fittings)
• Bleeding the brake system thoroughly

For someone who has never worked on cars before, this might be challenging. However, for enthusiasts who have done basic maintenance like oil changes, brake pad replacements, or simple electrical projects, a Line Lock installation is certainly achievable.

The most technically demanding aspect is properly cutting and flaring brake lines. This requires specific tools and techniques to ensure safety. If you’re uncertain about this aspect, consider:

• Having a mechanically inclined friend help with this specific part
• Practicing on scrap brake line before working on your vehicle
• Having a professional handle the brake line work while you do the electrical

Many beginners report successful installations by taking their time, following instructions carefully, and not rushing through the process. A well-installed Line Lock is a point of pride for many enthusiasts who tackle the project themselves.

Conclusion: Is the Hurst Line Lock Right for You?

After examining every aspect of the Hurst Line Lock—from installation to performance, legality to troubleshooting—the question remains: is it the right addition to your vehicle?

A Hurst Line Lock makes sense if:

• You regularly participate in drag racing or plan to start
• You want consistent burnouts for tire preparation
• Your vehicle has sufficient power to benefit from controlled launches
• You’re willing to invest in both the component and proper installation
• You understand the line between track use and street legality

It might not be worth the investment if:

• Your vehicle rarely or never sees track time
• You’re primarily interested in street performance
• Your vehicle has an advanced electronic brake system that complicates installation
• You’re not comfortable modifying your brake system

For serious racers and performance enthusiasts, the Hurst Line Lock represents one of those rare modifications that delivers both the “wow factor” and genuine performance improvements. The consistent tire preparation, improved launches, and precise control it offers can make a measurable difference in your racing results.

Whether you’re staging at your local drag strip’s Christmas tree lights or preparing for more serious competition, the control and consistency a quality Line Lock provides can be transformative. And yes, the impressive burnouts it enables certainly don’t hurt when it comes to the spectator appeal of your racing program.

Remember: install with care, test thoroughly, use responsibly, and enjoy the improved performance and control that comes with one of racing’s most trusted hydraulic assistants—the Hurst Line Lock.