BMW Z4 Series E85 2.5i M54 Front Right O/S Suspension Leg Brake Disc Axle

BMW Z4 Series E85 2.5i M54 Front Right O/S Suspension Leg Brake Disc Axle is an original suspension component designed for the front axle on the passenger side. This solution was created to maintain proper suspension geometry, precise vehicle handling, and stable load transfer from the shock absorber strut to the body. Thanks to its factory design, the steering knuckle works in harmony with other suspension components, ensuring consistent vehicle behavior on the road.

Specifications and technical data

• SKU: 6785988-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6785988
• Substitutable numbers: 31316785988, 6785988, 31211096430, 1096430, 34116758114, 6758114, 34116864060, 6864060, 31316770344, 6770344, 31211095198, 1095198, 34111165030, 1165030, 34111160352, 1160352
• Location on the vehicle: Front, Right
• Category: Suspension Component Replacement Kits

Purpose and function in the suspension

The steering knuckle integrated with the shock absorber mount is responsible for a rigid yet precise connection between the wheel hub, suspension strut, and steering components. In the front right section of the vehicle, it plays a key role in maintaining proper camber and toe angles, which translates into:

• stable handling of the BMW Z4 E85 at higher speeds,
• even tire wear,
• confident vehicle behavior during braking and acceleration,
• precise steering response.

Replacing a damaged or worn-out steering knuckle with an OEM part allows for the restoration of factory suspension performance without the need for structural modifications to the vehicle.

Category Suspension replacement kits – technical context

The presented item belongs to the Suspension replacement kits group, which consists of components responsible for transferring loads between the wheel and the body. In practice, this means that the steering knuckle with the shock absorber mount works with control arms, springs, shock absorbers, and mounting hardware to create a cohesive system responsible for ride comfort and safety. Selecting parts from the same design group facilitates:

• planning a comprehensive front-end repair,
• maintaining material and dimensional consistency of components,
• reducing the risk of geometry issues after installation.

Vehicle placement and fitment

The shock absorber steering knuckle is designed for the front, right side of the vehicle, which is important both when selecting the part and during subsequent geometry adjustment. Proper fitment to the specific side of the car is essential due to:

• differences in shape and mounting points compared to the left side,
• correct positioning of shock absorber mounts and steering components,
• maintaining factory reference points for wheel alignment.

Thanks to a design consistent with factory solutions, installation is predictable for the workshop, and after setting the geometry, it is possible to restore standard handling parameters.

Used condition and practical aspects

The item is offered in used condition, which allows for an economical repair while maintaining the original BMW design. In practice, this means the possibility of:

• reducing service costs compared to new components,
• maintaining compatibility with factory design solutions,
• easier matching with existing suspension components.

During installation, standard workshop procedures are recommended: checking mating suspension components, replacing worn bolts and nuts, and performing a final wheel geometry adjustment.

Technical support and selection of used suspension components

When planning a suspension repair in a BMW, it is worth paying attention to the differences between the standard configuration and any sports modifications, as well as the selection of used components in terms of design and compatibility. A detailed discussion of these issues, along with practical examples and comparison tables, can be found in the article Standard vs. sports suspension – design differences and is it worth buying used suspension parts?.

If you are planning a comprehensive repair or upgrade of the front suspension area in your BMW and need other elements from the same group, such as shock absorbers, springs, or control arms, check out the available parts in the BMW suspension replacement kits category.