034Motorsport Density Line Front Upper Control Arm Kit for Audi A4, A5, S4, S5, RS5, Q5, SQ5, and allroad (2008–2017)

Four front upper control arms, two front and two rear, make up the 034Motorsport Density Line Control Arm Kit, a performance replacement for all four factory front upper arms on 2008–2017 Audi A4, A5, S4, S5, RS5, Q5, SQ5, and allroad models. Each arm uses 65 durometer rubber bushings and new ball joints chosen to limit unwanted deflection in the suspension. 034Motorsport states that the result is tighter handling and sharper steering response than even new factory arms offer. The factory front upper arms on the B8 and B8.5 A4, S4, A5, S5, and RS5 can start wearing out as early as 40,000 miles, especially on cars driven hard on the street or track. As the factory bushings degrade and the ball joints develop play, alignment drifts and steering loses precision. The kit is a complete drop-in replacement and comes with an installation hardware kit. It is made in the United States.

034Motorsport parts sold by PMB Performance carry a 24-month warranty.

This kit covers both sides and both arm positions at once, so there is no left, right, front, or rear version to choose. It takes the place of factory Audi front upper control arms 8K0 407 505 A, 8K0 407 506 A, 8K0 407 509 A, and 8K0 407 510 A. On these five-link front ends, each side carries two upper arms that locate the top of the wheel carrier, so the front and rear upper arms work as a pair and wear together. Replacing all four keeps the bushing rate and ball joint condition matched across the axle. For the A4, the kit covers both the sedan and the Avant wagon. 034Motorsport develops its Audi and Volkswagen suspension parts at its Performance Facility in Fremont, California, where engineering, manufacturing, and tuning share one roof.

Technical Details

• Manufacturer: 034Motorsport, Density Line
• Part number: 034-401-1042
• Position: front upper control arms, front and rear, left and right
• Quantity: four arms plus an installation hardware kit
• Bushings: 65 durometer rubber
• Replaces factory Audi numbers 8K0 407 505 A, 8K0 407 506 A, 8K0 407 509 A, and 8K0 407 510 A
• Made in the United States
• Warranty: 24 months

Common Questions

How early do the factory upper arms wear on these cars?
034Motorsport notes they can start wearing as early as 40,000 miles, sooner on cars driven hard on the street or track.

What symptoms point to worn upper control arms?
Play at the joints, clunking from the front suspension, uneven tire wear, trouble getting a proper alignment, vibration through the steering wheel at highway speed, and wandering or pulling.

Do I need to buy hardware separately?
No. An installation hardware kit is included with the four arms.

PMB Performance sells the full Density Line arm set so the front end can be refreshed in a single job.

Fitment & Compatibility

Check the fitment table below for your exact model and year. Send us your VIN and we will confirm fit before you order.