034Motorsport Density Line Front Lower Control Arm Kit for Audi A4, S4, A5, S5, and RS5 (2010–2017)

Built for the B8 and B8.5 Audi A4, S4, A5, S5, and RS5, this 034Motorsport Density Line kit replaces all four factory front lower control arms and includes new M14 ball joints and installation hardware. Factory front lower arms on these cars can start to wear as early as 40,000 miles, especially on cars driven hard on the street or track. As the rubber bushings degrade and the ball joints develop play, alignment drifts and steering loses precision. The Density Line arms use 75 durometer rubber bushings and new ball joints to limit unwanted deflection, which tightens handling and sharpens steering response compared with even new factory arms. 034Motorsport makes the kit in the United States.

This 034Motorsport kit carries a 24-month warranty.

The front suspension on these cars uses two lower arms per side, one forward and one rearward, and this kit covers both positions on both sides. 034Motorsport specifies it for models with M14 ball joints, so check your car before ordering. The kit cross-references factory numbers 8K0407693S, 8K0407694S, 8K0407693Q, 8K0407694Q, 8K0407693AD, 8K0407694AD, 8K0407151D, 8K0407152D, and 4G0407689C. Other symptoms of worn lower arms include noise from the suspension, uneven tire wear, steering wheel shudder at highway speed, and wandering or pulling from side to side.

Technical Details

• Manufacturer: 034Motorsport
• Part number: 034-401-1043
• Product line: Density Line
• Bushings: high-durometer rubber, 75 durometer
• Ball joints: M14, one pair included
• Made in the United States
• Complete drop-in replacement for the factory front lower control arms
• Factory cross-references: 8K0407693S, 8K0407694S, 8K0407693Q, 8K0407694Q, 8K0407693AD, 8K0407694AD, 8K0407151D, 8K0407152D, 4G0407689C
• Warranty: 24 months

Common Questions

What comes in the kit?
Front-position lower control arms for the left and right sides, rear-position lower control arms for the left and right sides, a pair of M14 ball joints, and a lower control arm installation hardware kit.

When do the factory arms usually wear out?
Wear can begin as early as 40,000 miles, sooner on cars driven hard on the street or track.

Will this change how the car steers?
The 75 durometer bushings limit deflection, so steering response is more precise than with worn or new factory arms.

034Motorsport develops its Audi suspension parts in-house at its Fremont, California facility, and PMB Performance sells this complete kit for B8 and B8.5 owners.

Fitment & Compatibility

Check the fitment table below for the models and years this kit fits. Make sure your car uses M14 front ball joints. Send us your VIN and we will confirm fit before you order.