Powerflex PFF5-4101 Front Radius Arm to Chassis Polyurethane Bush Kit for BMW 4 Series xDrive F32 F33 F36 AWD - Pair | Replaces OE 31126854729 | Tension/Thrust Arm Bushes

BMW 4 Series xDrive F32 F33 F36 Front Lower Control Arm Rear Poly Bush Set – Powerflex PFF5-4101

Upgrade your AWD 4 Series steering feel and braking stability with this uprated front lower arm rear bushing set. Powerflex PFF5-4101 replaces the factory rubber mounts with durable polyurethane for sharper response, better caster control and consistent geometry under load. Ideal for fast-road use and daily driving, this is a proven handling upgrade for the F3x xDrive platform.

Part number: PFF5-4101
OE cross-reference: 31126854729
Quantity: Pair

Vehicle compatibility

BMW 4 Series xDrive only: F32 Coupe, F33 Convertible, F36 Gran Coupe.

Why choose this bush kit

• Quicker turn-in and improved on-centre feel during spirited driving
• Reduces deflection in the tension strut for stable braking and reduced shimmy
• Keeps wheel alignment true for more even tyre wear and better grip
• Maintains OE geometry with an engineered offset sleeve while limiting unwanted movement
• Polyurethane construction resists oil, road grime and ageing compared with rubber
• Refined NVH balance with a performance-focused feel
• Backed by the Powerflex Lifetime Warranty

What this replaces

Direct replacement for the rear pivot bush in the forward lower control arm, commonly referred to as the tension strut, thrust arm or radius rod bush. Swaps out the fluid-filled OE mount for a durable polyurethane assembly that maintains geometry and improves steering precision.

Real-world results

We run Powerflex bushes on our own builds and customers consistently report a tighter front end, less tramlining and more confidence through B-road corners after fitting PFF5-4101.

Kit contents

• 2 x polyurethane bushes and sleeves for the front lower arm rear position
• Designed specifically for BMW F32 F33 F36 xDrive front suspension

Fitting and support

Professional installation recommended. Book fitting with MJ Modifications in Warwickshire. For a fitted quotation, email info@mjmodifications.co.uk.

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