Brake Line Tuck Kit: How to Clean Up Your Honda or Acura Engine Bay

Josh Torres Jul 13, 2026

If you've ever popped the hood of a show-winning Honda or Acura build and wondered how the engine bay looks so impossibly clean, a brake line tuck kit is a big part of the answer. Factory brake hard lines, proportioning valves, and rubber hoses run across the firewall in plain sight. A brake line tuck kit relocates those components behind the dashboard or along hidden chassis paths, giving you that stripped-down, wire-tucked look without sacrificing braking performance.

Whether you're building an EG Civic drag car, a daily-driven EK hatchback, or an Integra headed to the show circuit, this guide breaks down exactly what a brake line tuck kit does, which kit fits your platform, and how to get the job done right.

What Is a Brake Line Tuck Kit?

A brake line tuck kit is a bolt-on package that replaces the stock hard lines running across your firewall and engine bay with new lines routed behind the dash or through the interior. Most kits also relocate the proportioning valve — the component that balances front-to-rear brake bias — so it's hidden from view.

A typical brake line tuck kit includes:

  • Pre-bent or straight stainless steel hard lines to replace the factory routing
  • Bulkhead fittings for clean firewall pass-throughs
  • Proportioning valve relocation hardware (behind-dash or inline)
  • All necessary adapters, brackets, and mounting hardware
  • Upgraded caliper hoses (in full tuck kits)

The result is a firewall with nothing on it but paint — exactly what judges, spectators, and your Instagram followers want to see.

Full Tuck Kit vs. Hard Line Replacement vs. Mini Tuck

Not every build needs the same level of tuck. Here's how the three main options break down:

Full Tuck Kit — The complete package. Relocates the proportioning valve behind the dash, replaces all engine bay hard lines, and includes an inline staging brake provision for drag builds. The Finishing Lines EF/CRX Full Tuck Kit is a perfect example — it's designed for booster-delete setups and gives you a completely bare firewall.

Hard Line Replacement Kit — Replaces the factory hard lines with fresh stainless steel lines that follow the stock routing but with cleaner bends and better corrosion resistance. Great for older chassis where the original lines are rusted or damaged. Available for EG Civics (92–95), EK Civics (96–00), and DC2 Integras (94–97).

Mini Tuck Kit — A middle ground. Relocates the proportioning valve and cleans up the main hard lines without a full booster delete. The DC2 Mini Tuck Kit with Adjustable Prop Valve lets you keep the stock master cylinder while still clearing the firewall.

Choosing the Right Kit for Your Platform

Finishing Lines engineers platform-specific brake line tuck kits for nearly every popular Honda and Acura chassis. Here's a quick reference:

Browse the full lineup in the Finishing Lines collection to find your exact chassis fitment.

How to Install a Brake Line Tuck Kit: Step by Step

While every platform has its own nuances, the general process for installing a brake line tuck kit follows these steps:

  1. Drain the brake system. Open the bleeder valves at each caliper and drain all fluid into a catch container. Remove the old fluid from the master cylinder reservoir.
  2. Remove the factory hard lines. Use a flare-nut wrench (10mm for most Hondas) to disconnect lines at the master cylinder, proportioning valve, and each junction. Penetrating oil is your best friend on 25-year-old fittings.
  3. Remove the proportioning valve. Unbolt it from the firewall. If you're doing a booster delete, remove the brake booster and master cylinder assembly at this stage too.
  4. Install bulkhead fittings. Mount the supplied bulkhead fittings through the firewall using the existing holes or drill new ones per the kit instructions.
  5. Route the new hard lines. Run the new stainless lines from the master cylinder through the bulkhead, behind the dash, and back out to the rear brake junction. Use billet brake hose separator clamps to keep lines secure and rattle-free.
  6. Install the relocated proportioning valve. Mount it in its new position (behind the dash or inline), and connect the lines per the kit's diagram.
  7. Connect caliper hoses. Attach the new braided or upgraded caliper hoses at each corner.
  8. Bleed the system. Fill the reservoir with fresh DOT-rated brake fluid and bleed all four corners, starting with the caliper farthest from the master cylinder (usually rear passenger). A pressure bleeder speeds this up significantly.
  9. Test. Pump the brake pedal to confirm a firm, consistent feel. Check every fitting for leaks before driving.

Pro Tip: Don't Forget the Clutch Line

If you're tucking brake lines, your clutch line is the next eyesore on the firewall. The Finishing Lines V2 Clutch Tuck Kit for EG/DC/EK handles B, D, and H-series swaps and tucks the clutch hydraulic line behind the dash alongside your brake lines. Doing both at once saves time, since you're already behind the dashboard. Pair it with a billet clutch reservoir for a finished look at the master cylinder.

Clean Up the Whole Build

A tucked firewall pairs perfectly with other engine bay upgrades. If you're working on a Honda Civic build, check out our Honda Civic Performance Parts: The Ultimate Build Guide from EG to Type R for a complete breakdown of bolt-ons, engine parts, and chassis upgrades by generation. For suspension, a strut tower bar is the next visual and functional upgrade — read our Best Strut Tower Bar Buyer's Guide for a deep dive.

Ready to clean up your engine bay? Shop all Finishing Lines brake and clutch tuck kits at JSI Racing and get your build looking as good as it performs.

Jul 13, 2026