Product Details
BC Racing BR Series Coilovers for the 2017+ Audi S4 (B9) are BC Racing's entry-level coilover and the most popular kit in their entire lineup — they offer the most accessible entry into adjustable coilover suspension without sacrificing performance, comfort, build quality, or handling. Every kit is extensively tested on the S4 B9 chassis and refined until it balances ride quality with performance — the reason S4 coilovers from BC Racing are the best-selling adjustable kits in their segment worldwide.
Every BR Series kit is built around a mono-tube damper with simultaneous compression and rebound adjustment at every corner — a wide damping range without the complexity of a race-only setup. Ride height is fully adjustable independent of spring preload, so you set the stance and the ride separately. Where BC Racing separates itself is tuning philosophy: every off-the-shelf spring rate and damper setup is chosen to stay comfortable on daily roads while still delivering real performance at the track. If you want something different, Swift Springs, custom rates, and custom valving are all options at checkout — BC will match the valving of the dampers to whatever springs you pick, something most brands don't offer outside their flagship race lineup.
BC Racing's reputation in the aftermarket suspension world is built on four things: competitive pricing that beats the rest of the fully-adjustable market, customization depth that rivals the top-tier race brands, long-term reliability earned over 20 years of production, and a rebuildable design that keeps the same set of dampers serving you through multiple builds. These S4 coilovers arrive tuned for the B9 chassis and ready to bolt in — no break-in period, no guessing at setup. Every kit ships with a 2-year manufacturer warranty, lifetime access to BC service parts (pistons, seals, shafts — no unit replacement required when it's time for a rebuild), and in-house tech support from both BC Racing and the Springrates team.
Features
- 30-level simultaneous compression/rebound damping adjuster
- Mono-tube damper with linear piston and hardened chrome shaft
- Ride height adjustable independent of spring preload
- Upper mount hardware varies by chassis — camber plates, pillowball, or reused OEM mounts. See the Specifications table for what's included on your kit.
- Swift Spring and custom spring rate upgrades available at checkout
- Custom damper valving paired with custom spring rates on request
- Fully rebuildable — replacement parts available from BC for the life of the shock
- 2-year manufacturer warranty against defects
Specifications
| Part Number | S-27-BR |
| Part Name | BR Series Coilovers |
| Vehicle | 2017+ Audi S4 FWD/AWD (B9) 53mm Front Strut |
| Drivetrain | FWD/AWD |
| Chassis Code | B9 |
| Damping Adjustment | 1-Way (30 levels) |
| Ride-Height Adjustable | Yes |
| Spring Rate - Front | 10 kg/mm |
| Spring Rate - Rear | 8 kg/mm |
| Spring Size - Front | 62-220-10K |
| Spring Size - Rear | 62-190-8K |
| Swift Springs - Front | 62-203-X |
| Swift Springs - Rear | 62-178-X |
| Camber Plates - Front | Not Applicable |
| Camber Plates - Rear | Not Applicable |
| Suspension Design - Front | True Coilover |
| Suspension Design - Rear | Divorced |
| Notes | Designed for 53mm front strut diameter — measure yours before ordering. |
Vehicle Fitment
- 2017 Audi S4 FWD/AWD (B9) 53mm Front Strut
- 2018 Audi S4 FWD/AWD (B9) 53mm Front Strut
- 2019 Audi S4 FWD/AWD (B9) 53mm Front Strut
- 2020 Audi S4 FWD/AWD (B9) 53mm Front Strut
- 2021 Audi S4 FWD/AWD (B9) 53mm Front Strut
- 2022 Audi S4 FWD/AWD (B9) 53mm Front Strut
- 2023 Audi S4 FWD/AWD (B9) 53mm Front Strut
- 2024 Audi S4 FWD/AWD (B9) 53mm Front Strut
- 2025 Audi S4 FWD/AWD (B9) 53mm Front Strut
- 2026 Audi S4 FWD/AWD (B9) 53mm Front Strut