Published: October 12, 2026 | Last updated: October 13, 2026
TL;DR
- The Eastwood Brake Line Tubing Straightener (33911) straightens coiled 3/16 and 1/4 inch tubing with steel rollers (Quadratec, 2026).
- It works on steel, stainless steel, aluminum and copper tubing, including fuel and transmission lines (Quadratec, 2026).
- A thumb switch on the side changes between the two tubing sizes (Quadratec, 2026).
- It is a small handheld tool, about 4 by 2 by 2 inches, with a one-year warranty (Quadratec, 2026).
- Owners like it for home brake line projects, but some wish it also handled 5/16 and 3/8 inch tubing (Walmart, 2026).
Disclosure: As an Amazon Associate, Brakes Hub earns from qualifying purchases. This never changes our verdicts.
How we reviewed this product: we studied Eastwood's product information, retailer listings and owner reviews. We did not run our own tests.
What Is the Eastwood Brake Line Straightener?
The Eastwood straightener is a handheld tool for taking the curves out of coiled brake line. Replacement brake tubing usually comes in a coil, and it needs to be straight before you can bend it into a clean, accurate shape.
Eastwood says the tool gives repeatable results from durable steel rollers (Quadratec, 2026). The part number is 33911.
It also works on fuel and transmission lines in the same sizes (Quadratec, 2026).
Why Straight Tubing Matters
Coiled tubing has a curve along its whole length. If you bend it without straightening it first, the line twists and wanders, and the finished brake line does not follow the path you planned.
Straightening first gives you a clean base, so each bend goes exactly where you mark it. This makes new lines look factory-made and fit neatly along the body.
A good comparison is ironing a shirt before folding it. The folds only come out neat if the fabric starts flat.
Eastwood Straightener Specifications at a Glance
| Specification | Eastwood 33911 |
|---|---|
| Tubing sizes | 3/16 inch (4.75 mm) and 1/4 inch (6.35 mm) |
| Tubing materials | Steel, stainless steel, aluminum, copper |
| Rollers | Steel |
| Size change | Thumb switch on the side |
| Size | About 4 x 2 x 2 inches |
| Warranty | One year |
Sources: Quadratec (2026); Walmart (2026).
How to Straighten Brake Line With the Eastwood Tool
To straighten brake line, set the switch to your tubing size, feed the line through the rollers and pull the tool along it in smooth passes. Follow these steps.
- Set the thumb switch to 3/16 or 1/4 inch to match your tubing.
- Unroll a little tubing from the coil and feed the end into the rollers.
- Hold the tubing and pull the tool along it in one smooth pass.
- Check the result and make another pass if it is still curved.
- Cut the tubing to length with a tubing cutter.
- Slide fittings on, flare the ends and bend with a tubing bender.
What Owners Say About the Eastwood Straightener
Owners call it a useful tool for anyone who makes their own brake lines. One owner who used it on a classic Ford pickup project said it worked well, but wished it also came in 5/16 and 3/8 inch sizes (Walmart, 2026).
Another owner said it was the lowest-cost straightener they found and worked well with nickel-copper brake line (Walmart, 2026).
Eastwood Straightener vs Other Line Tools
| Tool | Main job |
|---|---|
| Eastwood straightener | Straightening coiled tubing |
| Eastwood Triple Head Bender | Bending up to 180 degrees |
| Brake line forming pliers | Tight bends near fittings |
| Flaring tool | Making flares at each end |
Pros and Cons of the Eastwood Brake Line Straightener
The main strength of the Eastwood straightener is fast, repeatable straightening of the two most common brake line sizes, and the main limit is that it does not handle 5/16 or 3/8 inch tubing.
Pros
- Handles 3/16 and 1/4 inch tubing in one tool.
- Works on steel, stainless, aluminum and copper.
- Thumb switch makes size changes quick.
- Small and easy to hold.
Cons
- No 5/16 or 3/8 inch capacity (Walmart, 2026).
- Stainless tubing takes more effort.
- Only straightens; you still need a bender and flaring tool.
Common Brake Line Fabrication Mistakes
| Mistake | Result | Fix |
|---|---|---|
| Bending coiled tubing | Twisted, wandering line | Straighten first |
| Wrong roller setting | Marked or flattened tubing | Match the switch to the tube size |
| Cutting with a hacksaw | Rough, uneven end | Use a tubing cutter |
| Forgetting fittings | Cannot fit them after flaring | Slide fittings on before flaring |
Choosing Tubing for New Brake Lines
The straightener works with several tubing materials, and each has strengths.
- Copper-nickel tubing is easy to bend and flare and resists rust, which makes it popular for home projects.
- Coated steel tubing is strong and matches many factory lines.
- Stainless steel tubing lasts a long time but is harder to bend and flare, and some flaring tools do not support it.
Whatever you choose, use tubing sold for brake systems, match the original size, and use the correct flare type for your fittings.
Frequently Asked Questions About the Eastwood Straightener
What tubing sizes does the Eastwood straightener handle?
3/16 inch and 1/4 inch (Quadratec, 2026).
Can it straighten stainless steel brake line?
Yes. It works on steel, stainless steel, aluminum and copper (Quadratec, 2026).
Can I use it on fuel lines?
Yes. It also works on fuel and transmission lines (Quadratec, 2026).
How do I switch between sizes?
Flick the switch on the side with your thumb (Quadratec, 2026).
Does it come with a warranty?
Yes. Eastwood offers a one-year warranty (Quadratec, 2026).
Does it work on 5/16 inch tubing?
No. It only handles 3/16 and 1/4 inch tubing.
Summary: Is the Eastwood Brake Line Straightener Worth Buying?
- It straightens 3/16 and 1/4 inch tubing quickly and evenly.
- It works on steel, stainless, aluminum and copper.
- It is a useful first step for anyone making their own brake lines.
- Pair it with a tubing bender, a cutter and a flaring tool.
Check the Eastwood Brake Line Straightener on Amazon →
Safety note: brake lines carry high pressure. If you are not sure how to make or fit them, have a qualified mechanic do it.