How to Straighten Brake Lines from a Coil

Have you ever pulled a coil of brake lines out of storage only to find it’s become a tangled mess? Dealing with kinked or bent brake lines can be incredibly frustrating. But don’t worry – with some patience and the right techniques, you can get those puppies straightened out in no time.

Properly straightening brake lines is crucial for the safe operation of your vehicle. When lines are kinked, it restricts fluid flow which reduces braking power. It also makes the lines more susceptible to cracking or bursting – and the last thing you want is a brake failure because of a tiny crimp!

By following this comprehensive guide, you’ll learn several methods for straightening coiled brake lines. You’ll also discover useful tips to make the process smoother. So grab your lines, put on some good tunes, and let’s get straightening!

Here’s a quick step-by-step guide:

To straighten brake lines from a coil, first hang or lay them out to expose bends. Gently work lines by hand, use a rolling pin on a flat surface to flatten, employ a specialty brake line straightening tool, or carefully heat stubborn areas with a heat gun. Slowly manipulate while checking for leaks and weak spots, confirm smooth shape by test driving to ensure proper pressure and braking performance.

Why Straight Lines Matter

Before jumping into the how-to, it’s important to understand what’s at stake here. Straight brake lines are vital for a few key reasons:

  • Improves brake performance. When lines are straight and unkinked, fluid flows freely through the entire brake system. This allows your brakes to operate as designed, with strong, responsive braking power.
  • Prevents wear and damage. Bends and kinks wear down the metal over time. This eventually leads to cracks or ruptures.
  • Safe handling and control. With reduced braking capacity, your vehicle is much harder to control in emergency situations. We all know how unsettling an unexpected grab or soft brake pedal can be while driving!

Basically, straight lines = better performance, safety and longevity of one of your vehicle’s most crucial systems. Time for that brake line glow-up!

Choose Your Weapon: Straightening Methods

When dealing with a coiled tangle, you’ll want to start by loosely hanging or laying out the lines if possible. This lets you see the full picture so you can systematically tackle each snag.

There are a handful of ways to reshape the lines. The best method for you depends on factors like:

  • Type of line – copper vs steel
  • Diameter of line
  • Number and severity of bends
  • Tools you have access to

Here are some straightening options from manual to mechanical:

Bare Hands

The simplest approach is good ol’ elbow grease! Gently yet firmly grip the line on either side of the bend. Apply light, constant tension in the opposite direction. Be patient as you work out the kink slowly. Repeat for each bend. Watch for flattened or weakened spots as you go.

Rolling Pin and Flat Surface

For this method, utilize the smooth flat surface of a workbench or sturdy table. Lay out the line, then use a rolling pin or other cylindrical object to roll over it, applying pressure. The combination of the hardened surface underneath and rounded pressure from above helps coax the line straight. Check frequently to see which areas need more attention.

Brake Line Straightening Tool

As the name suggests, this specialty tool is designed specifically for brake line straightening. It resembles a bench vise with various shaped grooves and dies. Simply clamp the kinked portion of the line into the straightening dies and apply pressure. The tool does the work of consistently reshaping the line. Investing in a quality straightener saves lots of time and headaches.

Heat Gun

When dealing with a particularly stubborn coil that doesn’t want to budge, heat is your friend. A heat gun makes the line more malleable so it will bend without cracking or flattening. Be extremely careful not to overheat the line – just warm it enough to gently manipulate by hand.

Tips and Precautions

To achieve smooth, non-leaking brake lines, keep these pointers in mind:

  • Work methodically, moving slowly and checking as you go
  • Apply lubricant like WD-40 to reduce friction
  • Pay attention for weak/flattened spots
  • Replace any damaged sections
  • Double check final shape

Rushing through the process or using excessive force is likely to damage the line even further. So be patient, pad your workspace for comfort, and put on a good playlist. Taking your time leads to quality results.

How to Know When You’re Done

Straight enough is…straight! Visually, your lines should have a smooth, consistent curve without looking wavy or bumpy.

To confirm, take your freshly-minted lines for a test drive:

  • Check for leaks and seepage
  • Feel for soft spots under brake pedal pressure
  • Ensure even braking force side to side

If there are no leaks, odd sounds, or loss of pressure, congratulations! Bask in your brake line straightening glory.

Comparing 4 Key Straightening Methods

To help decide which option may work best for you, here’s a comparison of the main methods:

Hand StraighteningNo tools needed Low cost With patience, highly effectiveTime consuming Can weaken line if pulled too hard
Rolling Pin and Flat SurfaceSimple No special tools Low costNot as precise Moderately time consuming
Brake Line Straightener ToolVery quick Consistent results Minimal effort Highly preciseExpensive Need storage space Can damage line if forced
Heat GunEffective for stubborn coilsHigh risk of heat damage Low precision control

Additional aspects like your vehicle type, personal tool collection, budget, and time constraints will determine the optimum technique.

In Closing

Dealing with mangled brake lines fresh out of storage is no fun. But restoring smooth lines is incredibly rewarding, knowing that you’re preserving safety and brake system performance.

With this comprehensive guide to straightening methods, tricks, and precautions, you have all the knowledge needed for brake line redemption! Carefully work out those kinks and dings, roll up your sleeves, and enjoy the satisfaction of a job well done.


How can I prevent my brake lines from getting kinked in storage?

When putting away brake lines, carefully coil them so they don’t bend too tightly. Wrap them or hang them to provide support. Storing them protected and suspended off the ground keeps their shape.

What are brake lines made of?

Most modern brake lines are made of double-walled steel tubing for durability, coated with corrosion-resistant zinc. Some lines may be nickel-copper or copper alloy. Flex lines have an inner rubber hose.

Can I straighten brake lines while they’re still on the vehicle?

It’s not recommended. Removing them gives the access and visibility needed to fully straighten out bends, kinks and flatten spots. Attempting to straighten installed lines risks causing further damage.

Is it safe to drive with slightly bent brake lines?

It’s risky. Even minor restrictions in a brake line can allow moisture inside, reducing braking capacity. And existing bends are more prone to kinking further. Get even slightly imperfect lines replaced for optimal safety.

How will I know when my brake lines need to be replaced?

Signs of brake line replacement being needed are: visible rust/corrosion, cracks/damage, leaks, sudden loss of brake pressure, uneven braking, grabbing, and spongy brake pedal feel. If you notice any of these issues, have your brake lines inspected right away.

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