R 350 4MATIC (251.165) V6-3.5L (272.967) (2006)
2.
Mark spare tire air valve (A, Figure 1) using a highly visible pen.
Note:
Ensure to have sufficient light when checking the valve.
3.
Bend valve (A) to the right, as shown in Figure 2, and check for cracks and damage.
Note:
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Damage can occur on both the inside and outside of the valve.
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Damage on the inside of the valve is not visible, but can be determined as follows: If the valve can be easily bent, it is damaged.