Installing a line lock with a proportioning valve in a vehicle’s brake system is a modification that can improve control over your car’s brakes, particularly useful for activities like drag racing. Here’s a step-by-step guide on how to install a line lock with a proportioning valve:
Materials You’ll Need:
- Line lock kit (including the line lock solenoid)
- Proportioning valve kit (if not integrated into the line lock)
- Brake line tubing (typically 3/16-inch or 1/4-inch)
- Flare tool
- Tubing cutter
- Brake fluid
- Wrenches (typically 3/8-inch and 7/16-inch)
- Adjustable wrench
- Tubing bender (if necessary)
- Jack and jack stands
- Safety glasses
- Brake fluid catch pan
- Brake bleeder kit (optional)
Step 1: Safety Precautions
- Ensure the vehicle is parked on a level surface and securely supported with jack stands.
- Put on safety glasses to protect your eyes from brake fluid.
Step 2: Locate the Brake Lines
- Identify the brake lines you’ll be working with. These are usually located near the master cylinder, going to the front and rear brakes.
Step 3: Disconnect the Brake Lines
- Use a wrench to carefully disconnect the brake lines from the master cylinder. Be prepared for some brake fluid to leak out.
Step 4: Install the Proportioning Valve (if separate)
- If the proportioning valve is not integrated into the line lock, install it in the brake line running to the rear brakes. Follow the manufacturer’s instructions for proper placement and orientation.
Step 5: Install the Line Lock
- Install the line lock solenoid in the brake line that goes to the front brakes. Ensure the arrow on the line lock points towards the front brakes. Tighten the fittings with a wrench.
Step 6: Route the Brake Lines
- Route the brake lines as needed to connect the line lock and proportioning valve to the master cylinder and rear brakes. Use a tubing bender if necessary to ensure smooth, kink-free bends.
Step 7: Cut and Flare Brake Lines
- Cut the brake lines to the appropriate lengths, ensuring they reach the line lock, proportioning valve, and the rear brakes.
- Use a tubing cutter to make clean, square cuts on the brake lines.
- Use a flare tool to create double flares on the ends of the brake lines. Ensure the flares are secure and leak-free.
Step 8: Connect the Brake Lines
- Connect the brake lines to the line lock, proportioning valve (if separate), and the rear brakes. Tighten the fittings securely with wrenches.
Step 9: Bleed the Brake System
- Bleed the brake system to remove any air bubbles and ensure proper brake function. You can use a brake bleeder kit or have a helper pump the brake pedal while you open and close the bleeder valves on each brake caliper or wheel cylinder.
Step 10: Test the Line Lock
- Test the line lock by activating it to lock the front brakes while keeping the rear brakes free. Make sure it functions as expected.
Step 11: Check for Leaks
- Inspect all brake line connections for leaks. If you find any, tighten the fittings as needed and retest.
Step 12: Reconnect the Brake Lines to the Master Cylinder
- Carefully reconnect the brake lines to the master cylinder and ensure they are tightened securely.
Step 13: Refill Brake Fluid
- Top off the brake fluid reservoir with the appropriate brake fluid.
Step 14: Test Drive
- Take a test drive in a safe location to ensure that the brakes are functioning properly, and the line lock operates as desired.
Installing a line lock with a proportioning valve should only be done by individuals with a good understanding of automotive brake systems. If you’re not experienced with brake work, it’s strongly recommended to seek the assistance of a qualified mechanic to ensure the modification is performed safely and correctly.
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