Dutch to English Tech/Engineering Automotive / Cars & Trucks Description of operation of a truck axle

Bij het afstempelen van het voertuig zullen de luchtbalgen van de as, ter bescherming, automatisch ontlast worden.

This is in a section about the traction boost for operation of an axle on a truck. The previous paragraph has referred to the operation of the traction boost, the improvement in traction and warning lights. This is followed by the sentence above. My dictionaries all give 'stamp' or write down of shares for afstempelen which does not make much sense to me here. It occurs three times in this small section, including a reference to the signal "Voertuig afgestempeld". I have tried asking the project manager but he wasn't sure and I was advised to consult technical experts in the field.