Dorman 526-577 Lateral Arm - Rear Left Upper Rearward

Dorman 526-577 Rear Left Upper Rearward Lateral Arm

Dorman 526-577 is a steel lateral arm for the rear left upper rearward suspension position on select Audi models. It is built as a standard replacement part with rubber bushings and a bent boxed design to match the original suspension layout.

Key Features

• Steel construction for suspension service replacement
• Rubber bushings included for the attachment points
• Bent, boxed control arm design
• Standard replacement grade
• No ball joint, no grease fitting, and no mounting hardware included
• Direct replacement for OE part numbers 8W0505397C, 8W0505397E, and 8W0505397F

Detailed Description

This Dorman lateral arm, part number 526-577, is precision-engineered and tested for replacement use on the rear left upper rearward suspension location. It is compatible with 2017-2025 Audi A4, A4 allroad, and A4 Quattro; 2018-2025 Audi A5, A5 Quattro, and A5 Sportback; 2018-2025 Audi S5 and S5 Sportback; 2018-2019 Audi RS5; and 2021-2025 Audi RS5 and RS5 Sportback. For shoppers searching for a rear left upper rearward control arm for Audi A4 or Audi S5 applications, this part number 526-577 provides an OE-style service replacement with the correct bushing-style attachment points.

This part cross-references OE numbers 8W0505397C and 8W0505397E for the same application.

Common Problems This Part Can Address

• Worn suspension bushings causing looseness in the rear suspension
• Clunking or knocking from the rear left suspension area
• Uneven rear tire wear related to suspension arm wear
• Excessive play in the rear upper rearward control arm
• Restoring proper suspension geometry after arm wear or damage

Installation Notes and Tips

Verify the rear left upper rearward position before installation and compare the original arm length, shape, and bushing style to Dorman 526-577. Because mounting hardware is not included, reuse or source the correct fasteners as needed. Final torque should be set with the suspension at normal ride height to help protect the bushings.

Quality Assurance

Dorman states this lateral arm is precision-engineered and rigorously tested to provide a reliable replacement for the original equipment on specific vehicles. The steel construction, included bushings, and OE-reference fitment support consistent service replacement for Audi A4, A5, S4, S5, and RS5 rear suspension applications.