{"product_id":"wilwood-221-17398-rear-flexline-audi-a4","title":"Wilwood 09-16 Audi A4 Flexline Kit - Rear","description":"\u003ch4\u003eMatch Your Front Upgrade With A Firmer Rear Pedal Too\u003c\/h4\u003e\n\u003cp\u003eSwapping only the front brake hoses leaves the rear end of the system on aging rubber that still expands under pressure. The Wilwood 221-17398 rear flexline kit replaces the factory rear rubber hose on the Audi A4 with a braided stainless steel line, rounding out a full firm pedal upgrade front to rear.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eDirect bolt in replacement for the factory rear rubber brake hose\u003c\/li\u003e\n\u003cli\u003eBraided stainless steel construction resists expansion under hard braking\u003c\/li\u003e\n\u003cli\u003eDOT compliant for street legal use\u003c\/li\u003e\n\u003cli\u003eImproves brake pedal feel and response compared to aging rubber lines\u003c\/li\u003e\n\u003cli\u003eCorrosion resistant PTFE inner liner for long service life\u003c\/li\u003e\n\u003cli\u003eWilwood MPN 221-17398 rear position kit\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eFitment Table\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eYear Range\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e2009-2016\u003c\/td\u003e\n\u003ctd\u003eAudi\u003c\/td\u003e\n\u003ctd\u003eA4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eWilwood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMPN\u003c\/td\u003e\n\u003ctd\u003e221-17398\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePosition\u003c\/td\u003e\n\u003ctd\u003eRear\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eBraided Stainless Steel, PTFE Liner\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompliance\u003c\/td\u003e\n\u003ctd\u003eDOT Approved\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch4\u003eWhat's Included\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eRear brake flexlines (pair)\u003c\/li\u003e\n\u003cli\u003eMounting hardware\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eAbout Wilwood\u003c\/h4\u003e\n\u003cp\u003eWilwood 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.\u003c\/p\u003e\n\u003ch4\u003eRelated Parts on Our Site\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/wilwood-221-17396-front-flexline-audi-a4\"\u003eWilwood 221-17396 Front Flexline - Audi A4\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/wilwood-caliper-dynapro-radial-thin-pad-1-75in-pistons-81in-disc\"\u003eWilwood Dynapro Radial Caliper - 1.75in Pistons\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eFAQ\u003c\/h4\u003e\n\u003cstrong\u003eWhat is the Wilwood 221-17398?\u003c\/strong\u003e\n\u003cp\u003eThe Wilwood 221-17398 is a braided stainless steel rear brake flexline kit designed to replace the factory rubber brake hose on 2009-2016 Audi A4 models.\u003c\/p\u003e\n\u003cstrong\u003eWill this flexline fit my A4?\u003c\/strong\u003e\n\u003cp\u003eThis kit fits 2009-2016 Audi A4 model years at the rear position. Check your vehicle's model year against the fitment table above to confirm.\u003c\/p\u003e\n\u003cstrong\u003eIs this brake line DOT legal for street use?\u003c\/strong\u003e\n\u003cp\u003eYes, the Wilwood 221-17398 is DOT compliant and legal for street use.\u003c\/p\u003e\n\u003cstrong\u003eDo I need to replace the front lines too?\u003c\/strong\u003e\n\u003cp\u003eNot required, but replacing both front and rear flexlines together delivers the most consistent pedal feel improvement across the full brake system.\u003c\/p\u003e\n\u003cstrong\u003eDo I need to bleed the brakes after installing this flexline?\u003c\/strong\u003e\n\u003cp\u003eYes, the brake system must be bled after installation to remove any air introduced during the swap.\u003c\/p\u003e\n\u003cstrong\u003eDoes this kit include the front flexlines as well?\u003c\/strong\u003e\n\u003cp\u003eNo, this listing is for the rear position only. A separate front flexline kit is available if replacing all four corners.\u003c\/p\u003e\n\u003cstrong\u003eWhat material is the outer covering on this brake line?\u003c\/strong\u003e\n\u003cp\u003eThe line uses a braided stainless steel outer covering over a PTFE inner liner for durability and resistance to abrasion.\u003c\/p\u003e\n\u003cstrong\u003eCan this flexline be used with aftermarket brake calipers?\u003c\/strong\u003e\n\u003cp\u003eYes, as long as the caliper and hardline fittings match the factory thread and connection type, this flexline is compatible with OEM and most aftermarket setups.\u003c\/p\u003e\n\u003ch4\u003eInstall Instructions\u003c\/h4\u003e\n\u003col\u003e\n\u003cli\u003eRaise and safely support the vehicle, then remove the rear wheels.\u003c\/li\u003e\n\u003cli\u003eDisconnect the factory rubber brake hoses at the hardline and caliper connections.\u003c\/li\u003e\n\u003cli\u003eRemove the factory hoses and any retaining hardware.\u003c\/li\u003e\n\u003cli\u003eInstall the new Wilwood stainless steel flexlines, connecting them to the hardlines and calipers.\u003c\/li\u003e\n\u003cli\u003eTorque all fittings to manufacturer specification and secure with any retaining hardware.\u003c\/li\u003e\n\u003cli\u003eBleed the brake system to remove air introduced during installation.\u003c\/li\u003e\n\u003cli\u003eCheck for leaks and verify proper pedal feel before returning the vehicle to service.\u003c\/li\u003e\n\u003c\/ol\u003e\n","brand":"Wilwood","offers":[{"title":"Default Title","offer_id":46274435645519,"sku":"WIL221-17398","price":54.54,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/wilwood-221-17398-rear-flexline-audi-a4-clean_1ba20406-29d3-4a5d-bb86-421acc5deb29.webp?v=1785330780","url":"https:\/\/www.blackopsautoworks.com\/products\/wilwood-221-17398-rear-flexline-audi-a4","provider":"Black Ops Auto Works","version":"1.0","type":"link"}