BMW E64 Roof Hinge Soft Top Folding Top Frame Left N/S Hydraulic Lock 7123312

BMW E64 Roof Hinge Soft Top Folding Top Frame Left N/S Hydraulic Lock is a specialized component of the convertible roof mechanism, responsible for the precise guidance and locking of the structure during opening and closing. Thanks to the integrated hydraulic lock, it ensures stable system operation and proper load distribution during roof movement. This solution is intended for users who expect efficient operation of the folding roof and wish to restore its full functionality.

Specifications and technical data

• SKU: 7123312-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7123312
• Substitutable numbers: 7123312, 54347123312, 7125701, 54347125701
• Location on the vehicle: Left
• Category: Hardtops, Roof Panels & Parts

Purpose and function in the roof system

The presented folding top frame hinge is a structural component operating on the left side of the vehicle, working in conjunction with actuators and other joints of the mechanism. It is responsible for:

• guiding the roof segments along the correct trajectory,
• stabilizing the structure during movement,
• cooperating with the hydraulic lock during the roof locking and unlocking phase,
• transferring loads resulting from the operation of the entire system.

Thanks to this, the convertible roof can fold and unfold in a controlled manner, without excessive stress on other frame components.

Hydraulic lock and cooperation with the control system

The built-in hydraulic lock is part of the system responsible for securely locking the roof in the desired position. In practice, this means that upon reaching the end position, the roof is held in a stable state, and the pressure in the hydraulic system supports the locking process. A properly functioning hinge with a hydraulic lock:

• reduces the risk of play and rattling in the roof structure,
• ensures repeatability of movement during every opening and closing cycle,
• supports even force distribution throughout the entire mechanism.

This is particularly important in convertibles, where the precision of the roof's operation affects both driving comfort and body sealing.

Compatibility with BMW vehicles

The element has been designed as part of the BMW roof system, maintaining geometry and mounting points consistent with the manufacturer's factory solutions. This means:

• fitment to the original folding top frame,
• compatibility with the factory hydraulic system,
• possibility of installation in place of a worn or damaged component without interfering with the body structure.

Before installation, it is recommended to verify compatibility with the specific body version and compare the construction of the element with the part removed from the vehicle.

Condition, installation, and service application

The offered folding top frame hinge is a used part, which in practice means it comes from disassembly and is intended for further use after proper installation. This solution is often chosen in the case of:

• repairing the roof mechanism after mechanical damage,
• restoring system efficiency after a hydraulic failure,
• servicing a convertible where joints have worn out or moving parts have seized.

Professional installation by a workshop familiar with the construction of BMW convertible roofs allows for reducing vehicle downtime and minimizing the risk of recurring faults.

Technical support and additional materials

When planning service work on a convertible roof, it is worth considering the condition of the entire system – from hinges and actuators to the control unit. For vehicles with all-wheel drive, a broader service context may also be helpful. Detailed information on the operation of AWD systems in BMW vehicles and other brands can be found in the article xDrive, 4Matic, quattro or 4Motion – a comparison of AWD drives from BMW, Mercedes, Audi and VW, which discusses, among other things, typical components and the approach to used parts.

If you are planning a comprehensive repair or upgrade of the convertible roof area in your BMW and need other elements from the same group, such as guides, arms, or additional mechanism modules, check the available parts in the category Convertible roofs, car parts and BMW parts.