Powerflex Road Series PFF5-1901G Caster Adjustable Front Radius Arm to Chassis Poly Bushes (Pair) for BMW 4 Series F32 F33 F36 - Front Lower Control Arm Rear/Tension Strut Bush Upgrade

BMW 4 Series F32 F33 F36 Caster-Correction Urethane Arm-to-Body Bush Kit | PFF5-1901G

Unlock sharper steering, stronger front-end grip and rock-solid stability with this caster-adjustable urethane bush kit for the rear position of the front wishbone. Replacing the soft factory rubber with performance polyurethane keeps geometry consistent under load, improves braking stability and gives your 4 Series the precise, confidence-inspiring response it deserves.

Key details

• Part number: PFF5-1901G
• Fitment: BMW 4 Series F32 Coupe, F33 Convertible, F36 Gran Coupe
• Sold as: Pair, 2 bushes
• Diagram reference: 1

Why upgrade to these bushes

• On-car caster tuning: ±0.75 caster offset for precise alignment adjustment and improved steering feel
• Stiffer compound: approximately 60% firmer than OE rubber to resist deflection and keep the wheel located
• More camber while cornering: added caster promotes extra negative camber on lock for stronger turn-in and front-end bite
• Improved road manners: reduces wander, brake dive and vague feedback from tired factory bushes
• Better tyre life: helps control uneven wear by holding geometry steady under load
• Peace of mind: Powerflex Lifetime Warranty

Real-world results

We run these on our own cars and customers consistently report crisper response, a more planted front axle and greater confidence in fast-road driving. If you want a fixed-geometry option, choose PFF5-1901.

Also known as

Front wishbone rear mount, front arm rear bush, lollipop bush, compliance bush, compression arm bushing, alignment bush kit, caster correction kit, arm-to-body mounts, front trailing arm bush, front tension strut rear mount, polyurethane suspension bushes for BMW F32 F33 F36.

OE cross references

31126855743 / 31126855741 / 31126855742

Fitting and setup

For best results, have caster set on the car and a full alignment carried out after installation. MJ Modifications offers professional fitting and alignment in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Search-friendly terms

BMW F32 suspension bushes, F33 wishbone rear mount upgrade, F36 front arm rear bush kit, BMW 4 Series caster correction bushes, front compliance bush BMW, polyurethane bush kit F3x, front control arm rear mount upgrade, Powerflex PFF5-1901G, BMW 4er polybush, alignment bush BMW 4 Series.