Brake Line Locks, Roll Control Kits & Components

How Does a Line Lock Brake Kit Work?

A line lock brake kit uses an electric solenoid valve to trap hydraulic pressure in the front brake line. You press the brake pedal, activate the switch, and release the pedal. The solenoid holds pressure on the front brakes while the rear brakes release, so the rear tires can spin.

When you release the switch, the valve opens and the front brakes release too. That's the basic function of every kit in this category, whether it's called a line lock, roll control kit, or anti-roll kit. The solenoid installs in the brake line, so it works with the brake components you already run.

Kit contents vary, so check the parts list before you order and note anything else you'll need for the install. Only need the valve? Browse line lock solenoids to replace a worn unit or build your own setup.

What Types of Line Lock and Roll Control Kits Are Available?

The right kit depends on your vehicle, how you race, and how much of the install you want to source yourself. Here's what you'll find in this category:

• Universal solenoid kits, such as the Allstar Performance Electric Line Lock Kit and the Moroso Anti-Roll Kit Universal
• Vehicle-specific kits, including Hurst stainless-steel valve kits and the Granatelli Tire Fryer for 2010-2014 Mustang
• Stage control kits, including JEGS stage control solenoid valve kits, valves, and mounting hardware
• Right-front brake shut-off kits from JEGS and Allstar Performance for circle track setups
• Master cylinder lock and line kits from JEGS in universal and 1994-2004 Mustang versions
• Rebuild and switch components, including the Biondo Line Lock/Roll Control Solenoid and Hurst rebuild kits

Not sure which type fits your build? Start with your vehicle and how you race, then compare kit contents to see what's included.

Should You Install a Line Lock on the Front or Rear Brakes?

Most racers install a line lock in the front brake circuit. Holding the fronts lets the rear tires spin on a rear-wheel-drive car, and that's how most kits in this category are designed to work. You can also install a line lock in the rear circuit to block rear pressure, but confirm your kit supports that layout first.

Vehicle-specific kits take the guesswork out of placement. Hurst offers kits for the 2005-2009 Ford Mustang, 2008-2010 Dodge Challenger SRT8/R-T, and 2011-2014 Dodge Challenger SRT8. Universal kits give you more freedom, but you'll choose the mounting spot and route the lines yourself.

Before you cut into a brake line, map out your master cylinder, front brake lines, and any brake proportioning valves in the system. Keep the solenoid clear of moving parts, and leave room to run wiring to the activation switch.

How Do You Use a Line Lock for Burnouts and Staging?

For a burnout, press the brake pedal firmly, activate the line lock switch, and release the pedal. The front brakes stay locked while the rear tires spin and heat up. Release the switch to free the front brakes and roll out of the water box.

Staging works the same way. A line lock or stage control kit holds the car on the front brakes while you ease into the beams. That lets you focus on the throttle and the staging lights instead of balancing two pedals.

Practice the full sequence in a safe area before race day so each step becomes automatic. Get comfortable with the switch location, too, since you'll reach for it under pressure. Once your burnout and staging routine is dialed in, look at the rest of your setup. The JEGS drag racing tune-up guide covers more ways to prep your car for consistent passes.

How Do You Install and Bleed a Line Lock System?

Installing a line lock opens your brake system, so plan to bleed the brakes when you're done. Start by mounting the solenoid, then connect the brake lines and fittings. Wire the activation switch following the instructions included with your kit.

Some kits bundle extra tools. The Hurst Universal Roll Control Kit is available with lines, fittings, a tubing bender, and a brake bleeder. After the hardware is in, bleed the system until no air remains. Our guide on how to bleed a performance brake system walks through the process step by step.

Next, check each new fitting for seeps or drips under pedal pressure. If you find one, follow our steps on how to fix a brake fluid leak before you drive. When you're ready, shop all proportioning valves and line locks to finish your build.