Wilwood 221-17401 Rear Stainless Flexline Kit for 2008-2013 BMW M3 4.0L V8

Vehicle Fitment

• 2008-2013 BMW M3 (E90/E92/E93, 4.0L V8, RWD)

Fitment Notes

• Rear-position Flexline kit specifically listed by Wilwood for 2008-2013 BMW M3 applications.
• Applicable to the E9x-generation M3 sedan, coupe and convertible body configurations where the factory rear brake-line configuration matches.
• BMW M3 application uses the 4.0L V8 engine and rear-wheel drive.
• This is an OE-caliper replacement Flexline kit; it is not a universal brake-hose kit.
• No newer BMW M3 model-year application was verified for part number 221-17401.

Features

• Vehicle-specific rear Flexline kit engineered for the 2008-2013 BMW M3.
• Direct replacement for the factory rear rubber brake lines.
• PTFE inner liner provides a low-expansion hydraulic passage.
• Stainless-steel braid reinforces the hose and limits expansion under braking pressure.
• PVC outer armor helps protect the stainless braid and inner liner from abrasion and chafing.
• Higher temperature capability than conventional rubber brake hoses.
• Reduced hose expansion helps provide a firmer brake-pedal feel.
• Reduced expansion can improve brake response and hydraulic control.
• Vehicle-specific hose length and fittings are supplied for the listed BMW M3 application.
• Each Wilwood Flexline receives a 1,800 PSI pressure test.
• Includes necessary mounting hardware for the vehicle's original-model calipers.

Specifications

• Brand: Wilwood
• Part Number: 221-17401
• Product Type: Flexline Kit
• Position: Rear
• Vehicle: BMW M3
• Model Years: 2008-2013
• Platform: E90/E92/E93
• Engine: 4.0L V8
• Drivetrain: RWD
• Hose Construction: PTFE inner liner, stainless-steel braid and PVC outer armor
• Pressure Test: 1,800 PSI
• Application Type: OE-caliper replacement

Included Components

• 2x Rear Flexline brake hoses
• 1x Vehicle-specific mounting hardware set

Product Description

The Wilwood 221-17401 Rear Flexline Kit is a vehicle-specific high-performance brake hose upgrade designed for 2008-2013 BMW M3 models. Wilwood identifies this part as a rear Flexline kit for the BMW M3, with the appropriate hose length and fittings required to connect the vehicle's original hard lines to the original-model rear calipers.

Each Flexline uses a PTFE inner liner surrounded by tightly woven stainless-steel braid and protective PVC outer armor. The PTFE liner resists expansion under hydraulic pressure, while the stainless braid adds mechanical strength and helps maintain a consistent brake-pedal feel. The PVC exterior provides additional protection against abrasion and chafing in the underbody environment.

Designed as an OE-caliper replacement rather than a universal hose, the 221-17401 is intended for the rear brake system of the E9x BMW M3 with its 4.0L V8 and RWD configuration. Wilwood pressure-tests every Flexline to 1,800 PSI and supplies the necessary vehicle-specific mounting hardware. Proper hose routing, clearance and post-installation brake-system inspection should be completed before returning the vehicle to service.