Audi R8 42 Control Arm Mount Bracket Upper Rear Left N/S 420407457B

Audi R8 42 Control Arm Mount Bracket Upper Rear Left N/S is an original component from the Control arms and ball joints group, designed for the rear left side of the suspension. Specifically engineered for Audi R8 42 series models, it ensures precise wheel handling, body stability, and predictable vehicle behavior during dynamic driving.

Specifications and technical data

• SKU: 420407457B
• Mark: Audi
• Condition: Used
• OEM Part Number: 420407457B
• Substitutable numbers: 420407457B, 420 407 457 B
• Location on the vehicle: Rear, Left
• Gearbox type: No information
• Rim width: 8
• Category: Control Arms, Ball Joints & Assemblies

Purpose and function in the suspension system

The rear upper left control arm mount bracket is responsible for the stable connection between suspension components and the chassis, maintaining proper wheel geometry, and controlling the operation of the shock absorber and spring. In a sports car like the Audi R8, a correctly selected bracket is crucial for:

• maintaining constant tire contact with the road surface at high speeds,
• precise handling of the rear axle in corners,
• reducing unwanted play and knocking in the suspension,
• even load distribution to other chassis components.

Thanks to its perfect fit for the specific Audi model, the bracket works in harmony with the factory suspension geometry, which facilitates wheel alignment and camber adjustment after replacement.

Compatibility and mounting parameters

The presented bracket is intended for installation on the rear left side of the vehicle, in an axis responsible for bearing significant loads during acceleration and braking. The component's design is adapted to work with a wheel of a specific width, which allows for maintaining the correct distribution of forces at the tire contact patch and reduces the risk of uneven tire wear.

The element has been designed for integration with the Audi R8 drivetrain, including the specified transmission type, to maintain consistent handling characteristics and vehicle stability. Due to its factory origin, the correct mounting points are preserved, which facilitates installation and minimizes the risk of needing modifications.

Performance characteristics and benefits of use

Using an original rear upper left control arm mount bracket in an Audi R8 allows for restoring the vehicle's factory driving properties after a collision, wear of suspension components, or chassis modifications. Key benefits include:

• stable rear axle handling during highway and track driving,
• maintaining predictable vehicle response to steering inputs,
• reduction of vibrations and noise transmitted to the chassis,
• better cooperation with safety systems (ABS, ESP) thanks to correct wheel geometry.

As a structural suspension element, the bracket operates in the immediate vicinity of the control arm, ball joints, and shock absorber mounts, which is why its condition has a direct impact on ride comfort and safety under high dynamic loads.

Condition, origin, and service application

The offered bracket is a used part, which allows for cost-effective suspension repair while maintaining the manufacturer's original specifications. This solution is particularly beneficial for comprehensive service work, where multiple components are replaced simultaneously, and the priority is to maintain the vehicle's factory handling character.

The component is suitable both for standard replacement of worn parts and for suspension rebuilding after mechanical damage. Thanks to the preservation of original geometry and mounting points, the bracket facilitates correct suspension alignment at a diagnostic station after the work is completed.

If you are planning a comprehensive repair or upgrade of the suspension area in your Audi and need other elements from the same group, such as control arms, ball joints, or additional brackets, check out the available parts in the Audi Control arms and ball joints category.

Technical support and suspension knowledge

When working with suspension elements, it is worth using reliable sources of knowledge to correctly assess the condition of other components and plan the scope of repairs. Practical tips regarding diagnostics and operation of shock absorbers, control arms, and stabilizers can be found in the article Suspension system – a comprehensive guide to shock absorbers, control arms, and stabilizers, which will help you better understand the role of the bracket in the entire chassis system.

If you are considering a choice between new parts, replacements, or used components, the discussion of cost and quality differences available in the material Original, replacement, or used – which car parts are the most cost-effective? may also be useful, which will facilitate making an informed service decision.