Powerflex Black Series PFF5-401BLK Polyurethane Front Lower Control Arm Rear Bush | Radius/Caster/Tension/Thrust Arm/Wishbone Bushing for BMW 1 Series E81 E82 E87 E88, 3 Series E90 E91 E92 E93, Z4 E89, M3 E9

PFF5-401BLK Powerflex Black Series Front Lower Arm Rear Mount Bushings for BMW E8x, E9x and E89

Sharpen your BMW’s front end with the Powerflex Black Series PFF5-401BLK. This track-focused polyurethane bushing kit replaces the tired factory rubber inserts at the rear of the front lower arm, giving crisper steering, better braking stability and more consistent geometry under load. A proven fast-road and track-day upgrade for E81 E82 E87 E88 1 Series, E90 E91 E92 E93 3 Series, E89 Z4, E90 E92 E93 M3 and the E82 1M.

This assembly is commonly referred to as the caster arm bush, FLCA rear mount, front wishbone rear mount, front lower control arm rearward bush, tension arm rear mount or radius rod mount. If you are chasing precision, reduced deflection and repeatable alignment, this is the go-to solution.

Key benefits

• Locks in front-end geometry for confidence under heavy braking and quick direction changes
• Sharper initial turn-in with improved steering feel and feedback
• Helps reduce wheel hop and brake shimmy from worn OE rubber
• Durable polyurethane construction resists oil, heat and road contaminants for long service life
• Direct-fit replacement for the factory rearward control arm bush with no permanent modifications
• Ideal for lowered cars and coilover setups where alignment stability matters

We have installed these in-house on multiple E-chassis BMWs and the transformation is immediate. Customers consistently report tighter steering, better tyre contact and a more planted front axle on both road and circuit.

Fitment

BMW 1 Series: E81, E82, E87, E88

BMW 3 Series: E90, E91, E92, E93

BMW Z4: E89

BMW M: E90 E92 E93 M3 including GTS and Cabriolet, plus E82 1M Coupe

Replaces OE references

31120393540, 31126763719, 31102283579

What you receive

2 x bushings. You will require 2 bushings per car.

Part number

PFF5-401BLK

Manufacturer

Powerflex Black Series

Compatibility check

Add your UK registration or the last 7 digits of your VIN at checkout and we will verify fitment before dispatch for complete peace of mind.

Installation

Professional fitting recommended. Book with MJ Modifications in Warwickshire for expert installation and alignment setup. Request a quote via info@mjmodifications.co.uk.

Helpful resources

Download the installation guide

Search-friendly terms

BMW E90 suspension bush upgrade, E92 steering upgrade, E87 control arm bushing kit, E93 caster arm bush, E81 front wishbone rear mount, E89 Z4 front arm rear bush, E9x M3 front lower arm rearward bushing, 1M front caster bush, poly bushings for BMW, performance suspension bushes, front end handling upgrade, reduce steering wobble, improve braking stability.