BMW X5 F15 Rear Air Suspension

BMW X5 F15 Rear Air Suspension

If you've ever owned a BMW, then you know that the brand is known for their ultra-smooth and legendary drives.bmw x5 f15 rear air suspension However, if your ride has suddenly turned into more of a go-kart ride than an SUV, then there's likely a problem with the rear air suspension. Fortunately, you can solve this issue with the right parts from AEROSUS.

The bmw x5 f15 rear air suspension

The X5 and X6 offer five different shock and spring options to choose from, but the basic front and rear suspension architecture is the same across all packages. The basic suspension, found on most xDrive35i models, uses coil springs in the front and rear, while the comfort, professional, and M packages use rear air springs instead of the standard coils. The air springs are controlled by a control unit that monitors a number of sensors, including steering angle, stability control, and lateral acceleration, to adjust the suspension's height.

Upfront, both the basic and the adaptive shocks feature a double-wishbone design with a large lower control arm that supports the knuckle and rear spring, and two upper arms that set camber and toe angles. Depending on the option package, BMW adds either adaptive dampers or front struts with M-specific tuning. The M-specific struts also include M Performance brakes, which utilize massive four-piston fixed front calipers paired to large single-piston sliders. The rotors on the M-performance brake kit are larger than those used by the 50i model and have directional, vented faces that lack slotting or drilling.

Despite the similarities in front suspension architecture, the components vary significantly between the different options. The basic suspension uses a conventional coil spring, while the adaptive shocks and M-performance struts use hydraulic valve technology to control the height of the rear air springs. The upper and lower control arms are the most common wear points, as they are both responsible for setting the toe and camber angles. The inner bushing in the lower control arm, which is responsible for controlling the knuckle's vertical movement, is particularly susceptible to failure. This causes a loss of steering control and produces a shifty feeling from the rear end when it wears out.

The outer ball joint in the upper control arm is another common wear item. This bushing carries the majority of the front's load, and a worn one can cause the car to feel unbalanced as it turns. It's important to replace the bushing as soon as it shows signs of wear, which is typically identified by a greasy/oil residue around the joint.

The rear air springs' compressor is a frequent point of failure, as it continually tries to fill the air bags with compressed air. If the compressor burns out, then your air bags will no longer inflate and you'll experience a rough ride. The best way to prevent this is to regularly inspect the condition of your air springs, and replace them as soon as they show signs of wear or damage.

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