HEL BMW F32 F33 F36 Stainless Steel Front and Rear Brake Lines for BMW 4 Series 420i 430i 440i - Part Number BMW-4-639
Upgrade the braking performance of your BMW 4 Series with HEL Performance stainless steel braided brake lines. This front and rear brake line kit is a direct-fit replacement for the standard flexible rubber hoses on BMW F32, F33 and F36 models, including 420i, 430i and 440i, plus LCI variants. If you want sharper pedal feel, faster response and consistent braking on road and track, this BMW-4-639 kit delivers every time.
Stainless steel braided brake lines are one of the best value performance upgrades you can make to a BMW 4 Series. HEL brake lines minimise expansion under pressure, eliminate the spongy pedal feel associated with ageing rubber lines and give you precise feedback when you need it most. Built with stainless steel fittings and a PTFE inner hose with a protective PVC cover, this is a durable, corrosion resistant, long lasting brake hose kit designed for performance and reliability.
We run HEL lines on our own cars and our customers love the improved pedal bite and control. Order today, choose your preferred colour and enjoy a confident, firm brake pedal on fast road driving and track days.
Why choose HEL stainless steel brake lines for your BMW F32 F33 F36
- Sharpened brake pedal feel and response for BMW 4 Series F32, F33 and F36
- Stainless steel braided construction reduces hose expansion under heavy braking
- Precision control and modulation for road and track driving
- Stainless steel fittings for superior corrosion resistance and durability
- Direct replacement brake hose kit, front and rear, for 420i, 430i and 440i
- Quality components from HEL Performance with lifetime warranty
Key features and specifications
- Part number: BMW-4-639
- Line inner material: PTFE
- Line outer material: Stainless steel (303 or 304) with protective PVC cover
- Fittings material: Stainless steel (303 or 304)
- Temperature range: -70°C to 260°C (-94°F to 500°F)
- Inside diameter: 3.5 mm (0.138")
- Outside diameter: 7.5 mm (0.295")
- Maximum working pressure: 290 Bar (4206 PSI)
- Burst pressure: 870 Bar (12618 PSI)
- Minimum bend radius: 38 mm (1.496")
What is included
- Front and rear stainless steel braided brake lines
- Stainless steel banjo bolts if required by the fittings
- Copper crush washers if required by the fittings
- Lifetime warranty keyring fob
- Installation leaflet
Compatibility
- BMW 4 Series F32 Coupe 11/2012 to 02/2017
- BMW 4 Series F32 LCI Coupe 05/2016 to 12/2019
- BMW 4 Series F33 Convertible 03/2013 to 02/2017
- BMW 4 Series F33 LCI Convertible 05/2016 to 12/2019
- BMW 4 Series F36 Gran Coupe 07/2013 to 03/2017
- BMW 4 Series F36 LCI Gran Coupe 05/2016 to 12/2019
- Engine variants: 420i, 430i, 440i
Fitting and support
Professional installation is recommended. For fitting, contact Nforcd in Warwickshire and request a quote at Sales@nforcd.com. We are happy to help with advice on setup and brake fluid choices for fast road and track day use.
Manufacturer and warranty
Manufactured by HEL Performance. Backed by the HEL Lifetime Warranty for peace of mind and long term reliability.
Buy with confidence
We have fitted and used HEL brake lines on our own BMW builds and customer cars. Feedback is consistently positive for pedal firmness, precision and braking confidence. Choose your colour, add to basket and transform the way your BMW 4 Series stops.
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