Powerflex Black Series PFF5-1901BLK Front Radius Arm to Chassis Bushes (Pair) for BMW 4 Series F32 F33 F36 - Track/Motorsport Polyurethane Tension Strut/Front Control Arm

Powerflex Black Series PFF5-1901BLK Poly Bush Kit for BMW 4 Series F32 F33 F36

Transform the way your 4 Series turns in, brakes and holds a line. This Powerflex Black Series kit replaces the factory rubber at the rear position of the front lower arm, often called the thrust arm, caster arm or tension strut bush. By using a high-durometer 95 Shore A polyurethane, PFF5-1901BLK dramatically cuts unwanted movement at the front axle, keeping alignment true for razor-sharp steering accuracy and rock-solid stability when you push on.

Built for serious driving, these competition-grade bushings deliver consistent performance during track days and fast-road use. Expect crisper feedback through the wheel, better confidence under hard braking and noticeably tighter front-end control. We use these bushes on our own builds and customer cars and the results are outstanding, with repeat buyers praising the improved precision and durability compared to standard rubber.

• Part number: PFF5-1901BLK
• Fitment: BMW 4 Series F32 coupé, F33 convertible, F36 Gran Coupé
• Location: Front lower control arm rear position to body
• Compound: Black Series polyurethane, 95 Shore A
• Pack size: Pair
• Diagram reference: 2
• Replaces OE numbers: 31126852991 and 31126852992

What you will feel

• Sharper turn-in with more immediate response
• Reduced deflection for stable camber and toe control
• Greater confidence under heavy braking and quick direction changes
• Long-lasting performance that outlives and outperforms factory rubber
• Motorsport-ready consistency for session after session

Why choose this upgrade

The standard fluid-filled or rubber bushes allow significant movement that can cause steering shimmy, vague feedback and geometry shift under load. The Powerflex Black Series construction resists distortion, keeping the wheel positioned where it should be for predictable handling, cleaner feedback and improved front-end grip. It is a simple, high-impact upgrade that supports coilovers, performance tyres and big brake kits by keeping the chassis geometry locked in.

Ideal search terms

BMW F32 F33 F36 thrust arm bushings, front caster arm bush upgrade, F3x wishbone rear bush, compression arm poly bush kit, front lower arm inner bush polyurethane, BMW 4 Series suspension arm bushes, track day bushings BMW, alignment control bushing upgrade, performance front arm bushes, polyurethane front suspension bushes, steering wobble under braking fix, Powerflex Black Series bushes for BMW 4 Series, tension strut to body bush replacement, uprated control arm bushes, BMW F3x front end handling upgrade.

Fitting and support

Professional installation recommended. MJ Modifications in Warwickshire can supply and fit this kit. Request a fitting quote at info@mjmodifications.co.uk.

Order your PFF5-1901BLK today for a tighter, more connected drive and proven reliability on the road and at the circuit.