Wilwood 221-17398 Rear Stainless Flexline Kit for 2009-2016 Audi A4

Vehicle Fitment

• 2009-2016 Audi A4 (B8, Sedan/Avant, applicable 2.0L I4 TFSI and 3.0L V6 configurations; FWD/quattro AWD where factory rear-line configuration matches)

Fitment Notes

• Wilwood specifically catalogs part 221-17398 as a rear Flexline kit for 2009-2016 Audi A4 applications.
• Designed for the rear brake position and intended for the corresponding OEM brake-line and caliper configuration.
• The B8-generation A4 was offered with both front-wheel-drive and quattro all-wheel-drive configurations; verify the vehicle's original rear brake configuration before installation.
• Vehicle-specific chassis and caliper fittings are part of Wilwood's direct-fit OEM Performance Flexline design.
• No 2017 or newer Audi A4 application is cataloged by Wilwood for part number 221-17398.

Features

• Vehicle-specific rear stainless-steel braided Flexline kit for Audi A4.
• Direct-fit OEM Performance design with application-specific fittings.
• One-piece construction incorporates the correct chassis and caliper fittings.
• Stainless-steel braided construction helps reduce compliance within the brake system.
• Reduced brake-line expansion helps provide a firmer pedal response.
• Improved hydraulic control can contribute to more consistent brake-system response.
• Clear anti-chafing coating helps protect the exterior of the Flexline from wear.
• Designed specifically for the rear brake system rather than as a universal brake hose.
• Application-specific construction simplifies replacement of the corresponding OEM rear flexlines.
• Manufactured as part of Wilwood's OEM Performance Flexline product range.

Specifications

• Brand: Wilwood
• Part Number: 221-17398
• Product Type: OEM Performance Flexline Kit
• Position: Rear
• Vehicle: Audi A4
• Model Years: 2009-2016
• Platform: B8
• Engine Applications: Applicable Audi A4 factory engine configurations using the corresponding rear brake-line setup
• Drivetrain: FWD and quattro AWD applications where configuration matches
• Construction: Stainless-steel braided Flexline
• Design: One-piece, application-specific construction
• Fittings: Vehicle-specific chassis and caliper fittings
• Exterior Protection: Clear anti-chafing coating

Included Components

• 2x Rear Flexline brake hoses

Product Description

The Wilwood 221-17398 OEM Performance Flexline Kit is a vehicle-specific rear brake hose upgrade designed for 2009-2016 Audi A4 models. Wilwood identifies this part specifically as a rear Flexline kit for the Audi A4 and engineers the assembly with application-specific chassis and caliper fittings for direct integration with the corresponding factory brake system.

The stainless-steel braided Flexline construction is designed to reduce compliance in the hydraulic brake system compared with conventional flexible brake hoses. By helping limit hose expansion under braking pressure, the design provides a firmer pedal response and improved brake control. A clear anti-chafing coating further protects the hose from exterior wear during normal suspension and chassis movement.

This kit is intended for the rear brake position on the B8-generation Audi A4 and covers the 2009-2016 model-year range listed by Wilwood. Because Audi A4 models were offered with different drivetrains and brake configurations, the vehicle's original rear brake hardware and hose configuration should be verified before installation. After installation, inspect hose routing and clearance and bleed the brake system according to the applicable vehicle service procedure.