BMW 1 3 Series E81 E87 E90 E91 E92 Front Seat Lordosis Lumbar Pad Support Pump

Description

BMW 1 3 Series E81 E87 E90 E91 E92 Front Seat Lordosis Lumbar Pad Support Pump is a specialized component of the backrest adjustment system, responsible for precise control of the lumbar cushion. It allows the driver and passenger to achieve stable, ergonomic spinal support in the front seat, which translates into higher comfort during daily use and longer journeys. This is a practical solution for users who want to restore the full functionality of the factory lumbar support system in their BMW.

Specifications and technical data

• SKU: 7138786
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7138786
• Substitutable numbers: 52107138786, 7138786, AS
• Location on the vehicle: Front
• Category: Seats and Sofas

Purpose and compatibility

The presented lumbar support pump is designed for installation in the front seats of BMW 1 and 3 Series, generations E81, E87, E90, E91, E92. The component works with the factory lordosis adjustment system, responsible for inflating and deflating the lumbar cushion in the seat backrest. The placement on the vehicle is clearly defined as the front, which facilitates part selection during repairs or interior reconfiguration.

The pump is part of the original system used by the BMW brand, ensuring compatibility with the factory electrical installation and seat construction. This solution is particularly important when restoring full seat functionality after upholstery replacement, interior modernization, or post-collision repair.

Function and operating principle

The lumbar support pump is responsible for generating pressure in the lumbar cushion system within the seat backrest. In practice, this means that once the seat control is activated:

• it pumps air into the lumbar cushion, increasing its volume,
• it enables adjustment of the inflation level, and thus the shape of the backrest,
• it works with the seat control system, ensuring smooth setting changes.

Thanks to a functional pump, it is possible to achieve precise adjustment of the backrest to the natural curvature of the spine, which improves lumbar stabilization and reduces fatigue while driving.

Application in tuning and interior restoration

This element is particularly useful for projects related to BMW interior tuning or converting standard seats to versions with lumbar adjustment. It allows for the restoration of the full functionality of factory seats with advanced adjustment, which increases the vehicle’s utility value and driving comfort. It also works well for seat and bench restoration when it is necessary to recreate the original lumbar support system.

If you are interested in a broader context of cabin modernization using dismantled parts, it is worth checking out the guide Car interior tuning with Global Parts, which discusses the practical application of used seats and other interior components.

Benefits of using the original lumbar support pump

Using the original pump in a BMW 1 or 3 Series front seat brings a number of measurable benefits:

• Factory fit – compatibility with the seat construction and vehicle installation, without the need for modifications.
• Restoration of driving comfort – restoring full lordosis adjustment in the driver or passenger seat.
• Consistency with the safety system – maintaining the original interior architecture, which is important for integration with other seat components.
• Economical repair – the ability to restore the efficiency of the lumbar support system without the need to replace the entire seat.

Condition and origin of the component

The pump comes from the Seats and benches group and is a used item, which in practice means real savings while maintaining the manufacturer’s original specifications. This solution is particularly beneficial when servicing older BMW models, where the availability of new components is sometimes limited, and dismantled parts allow for efficient and cost-effective repair.

If you are planning a comprehensive repair or modernization of the seating area in your BMW and need other elements from the same group, such as frames, adjustment mechanisms, or additional comfort modules, check the available parts in the BMW Seats and benches category.

In a situation where you are looking for broader information on using dismantled components for servicing older models, the article No parts at the dealership? How to deal with repairing older models using dismantled parts, which describes a practical approach to repairs using original used elements, may be helpful.