Fill the air spring in vehicle riding height position - AR32.22-P-1500-03T

WARNING: This page is about a different car, the 2011 Mercedes-Benz C300, 2010 Mercedes-Benz C300, 2009 Mercedes-Benz C300, and 2008 Mercedes-Benz C300. However, it is still accessible from the selected car via links, so may be relevant.

SUSPENSION STRUTS

Number	Designation		Model 211 Airmatic
BA32.25-P-1008-04B	Nut, rear air spring at spring control arm	Nm	150
BA32.25-P-1009-04B	Air suspension pressure line at rear axle distributor	Nm	2

The bolted connection (1) of the air spring (2) on the spring control arm (3) must be loose. The left and right air springs (2) must each be filled separately.

Attach compressed air connection to compressed air distributor of the rear axle .
Prefill air spring (2) by means of STAR DIAGNOSIS (max. 0.5 bar): compressor running time or filling time approx. 2 s.
Position the transmission lifter (4) at the spring control arm (3).

Fig 1: Positioning Transmission Lifter At Spring Control Arm
Courtesy of MERCEDES-BENZ USA
Measure angular position of rear axle shaft (65) using electronic inclinometer.
The connecting cable (086b) from the sensor (086a) must point towards the center of the vehicle otherwise an incorrect measurement ensues. The test points on the rear axle shaft (65) must be cleaned.
Raise the spring control arm (3) with the transmission jack (4) until the rear axle shaft (65) has reached the specified value in the design level. Specified value in design level: -1.2°.
Fill air spring (2) to medium pressure using STAR DIAGNOSIS (2 bar): compressor running time or filling time approx. 10 s.

Fig 2: Measuring Angular Position Of Rear Axle Shaft
Courtesy of MERCEDES-BENZ USA
Check the alignment of the air spring (2) in the vehicle riding height position.
The air spring (2) must be straight and parallel to the shock absorber (5). Observe dimensions (b, c):

Dimension (b) 36.4 mm

Dimension (c) 18.7 mm

The protective boot (6) of the air spring (2) must be free to move and as able to be lifted upwards off the inflated air spring bellows. The folds in the protective boot (6) must be correctly trained and must not have any intrusions (arrow), if necessary remove the intrusion by hand.

Fig 3: Locating Protective Boot Of Air Spring
Courtesy of MERCEDES-BENZ USA
If the air spring (2) is buckled, bleed all compression, lower spring control arm (3) with transmission jack (4), align air spring (2) and start new charging attempt.

Fig 4: View Of Buckled Air Spring
Courtesy of MERCEDES-BENZ USA
Tighten the bolted connection (1) of the air spring (2) at the spring control arm (3) in the vehicle riding height position
Lower spring control arm (3) with transmission jack (4).
Fill air spring (2) using STAR DIAGNOSIS (5 bar): compressor running time or filling time approx. 20 s.

Fig 5: Lowering Spring Control Arm
Courtesy of MERCEDES-BENZ USA
Check the alignment of the air spring (2) at full rebound travel:
The air spring (2) forms a gentle curve relative to the damper (5). The protective boot (6) should not be in contact with the damper (5), and the inner air spring bellows should not press against the damper (5). The protective boot (6) of the air spring (2) must move freely and be able to be raised by the inflated air spring bellows. The folds in the protective boot (6) must be correctly trained and should not display any intrusions toward the inside, respond to requirement by removing intrusions by hand.
Read out the diagnostic trouble code memory using STAR DIAGNOSIS and erase if necessary.

Fig 6: View Of Correct Alignment Of Air Spring
Courtesy of MERCEDES-BENZ USA