BMW X3 Series E83 2.0d N47 Rear Right O/S Suspension Leg Arm Brake Caliper Disc

BMW X3 Series E83 2.0d N47 Rear Right O/S Suspension Leg Arm Brake Caliper Disc is a complete rear suspension component designed for the drive axle of this model, allowing for the precise restoration of the suspension geometry and stiffness. This used component from the Suspension replacement kits group enables a technically correct replacement of a damaged assembly without the need for costly reconstruction of the entire suspension. It is a solution for users expecting factory-fitment and predictable vehicle behavior on the road.

Specifications and technical data

• SKU: 3420502-4
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 3420502
• Substitutable numbers: 33303420502, 3420502, 33303402536, 3402536, 34216765884, 6765884, 33207537608, 7537608, 33217540116, 7540116, 34213332217, 3332217, 33303413256, 3413256, 33303405878, 3405878, 34216750162, 6750162
• Location on the vehicle: Rear, Right
• Category: Suspension Component Replacement Kits

Purpose and vehicle placement

The presented steering knuckle assembly with control arm is designed for the rear right side of the vehicle, which is crucial for proper wheel tracking, maintaining alignment, and stability during acceleration and braking. The component operates in a critical area connecting the hub, control arms, and braking system, which is why its proper fitment to the BMW X3 E83 with the 2.0d N47 engine is essential for safety and driving comfort.

Technical characteristics of the suspension assembly

The steering knuckle integrated with the control arm creates a rigid reference point for the entire rear suspension corner, transferring loads from the wheel to the body and working in conjunction with the shock absorber and spring. The design intended for this BMW model ensures:

• stable wheel tracking in both vertical and horizontal planes,
• proper mounting points for other suspension components,
• retention of factory camber and toe angles after proper geometry adjustment,
• consistent operation with the braking system and traction control systems.

As a result, after replacing the damaged element, you can restore predictable cornering behavior, stability at higher speeds, and even tire wear.

Benefits of using an original used component

Choosing an original, used steering knuckle assembly with control arm for a BMW allows you to maintain factory suspension geometry and correct mounting points, which is difficult to achieve with aftermarket parts of uncertain origin. Such a component:

• is structurally compliant with the vehicle manufacturer's specifications,
• facilitates installation without modifications or adjustments,
• reduces the risk of geometry alignment issues after repair,
• represents a reasonable compromise between cost and durability.

This is particularly important for load-bearing suspension elements, where precision and dimensional compliance directly affect safety.

Professional installation and operation

Due to the nature of the rear suspension operation in the BMW X3 E83, installation by a workshop equipped with the appropriate tools for disassembly and re-alignment of the geometry is recommended. After installation, it is advisable to perform:

• a condition check of the remaining suspension components on both the right and left sides,
• measurement and adjustment of the rear axle toe and camber,
• a check of the interaction with the braking system and safety systems.

Such a replacement will allow you to fully utilize the potential of the steering knuckle assembly with control arm and restore predictable vehicle handling.

Repair expansion and additional technical materials

If you are planning a comprehensive repair or upgrade of the rear axle suspension zone in your BMW and need other elements from the same group, such as additional control arms, mounts, or related components, check the available parts in the BMW suspension replacement kits category.

When deciding on the scope of chassis repairs, it is also worth analyzing the cost-effectiveness of using original used components in other drivetrain assemblies – our blog article may be helpful: Manual transmission failures – why an original used part is sometimes a better choice than remanufacturing.