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Give Your M3's Brakes The Response They Deserve
A high output V8 deserves a brake pedal that matches its performance, but factory rubber hoses flex under hard braking and dull the feedback you need at the track or on your favorite backroad. The Wilwood 221-17401 rear flexline kit swaps the stock rubber hose on the BMW M3 for a braided stainless steel line, sharpening pedal feel corner after corner.
Key Features
- Direct bolt in replacement for the factory rear rubber brake hose
- Braided stainless steel construction resists expansion under hard braking
- DOT compliant for street legal use
- Improves brake pedal feel and response compared to aging rubber lines
- Corrosion resistant PTFE inner liner for long service life
- Wilwood MPN 221-17401 rear position kit
Fitment Table
| Year Range | Make | Model |
|---|---|---|
| 2008-2013 | BMW | M3 |
Specifications
| Detail | Value |
|---|---|
| Brand | Wilwood |
| MPN | 221-17401 |
| UPC | N/A |
| Position | Rear |
| Construction | Braided Stainless Steel, PTFE Liner |
| Compliance | DOT Approved |
What's Included
- Rear brake flexlines (pair)
- Mounting hardware
About Wilwood
Wilwood Engineering has designed and manufactured high performance brake systems for street, off road, and racing applications for decades. Their stainless steel flexlines are built to the same standard as their brake kits, giving daily drivers and racers alike a firmer, more consistent pedal.
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FAQ
What is the Wilwood 221-17401?The Wilwood 221-17401 is a braided stainless steel rear brake flexline kit designed to replace the factory rubber brake hose on 2008-2013 BMW M3 models.
Will this flexline fit my M3?This kit fits 2008-2013 BMW M3 model years at the rear position. Check your vehicle's model year against the fitment table above to confirm.
Is this brake line DOT legal for street use?Yes, the Wilwood 221-17401 is DOT compliant and legal for street use.
Why upgrade from a rubber brake line to a stainless steel flexline?Rubber brake hoses expand under hydraulic pressure, especially as they age, which softens pedal feel. A braided stainless steel line with a PTFE liner resists that expansion, giving a firmer and more responsive pedal.
Do I need to bleed the brakes after installing this flexline?Yes, the brake system must be bled after installation to remove any air introduced during the swap.
Does this kit include the front flexlines as well?No, this listing is for the rear position only. A separate front flexline kit is required if replacing all four corners.
What material is the outer covering on this brake line?The line uses a braided stainless steel outer covering over a PTFE inner liner for durability and resistance to abrasion.
Can this flexline handle track use?Yes, the braided stainless steel construction and PTFE liner are designed to resist expansion under the sustained heavy braking common in track driving.
Install Instructions
- Raise and safely support the vehicle, then remove the rear wheels.
- Disconnect the factory rubber brake hoses at the hardline and caliper connections.
- Remove the factory hoses and any retaining hardware.
- Install the new Wilwood stainless steel flexlines, connecting them to the hardlines and calipers.
- Torque all fittings to manufacturer specification and secure with any retaining hardware.
- Bleed the brake system to remove air introduced during installation.
- Check for leaks and verify proper pedal feel before returning the vehicle to service.
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