Why would the front axle vent cap blow off?

The front axle vent cap may blow off due to excessive pressure buildup inside the axle housing, often caused by overheating or the expansion of gases. This can occur if the axle lubricant is contaminated or if the axle experiences significant thermal cycling, which increases internal pressures. Additionally, a blocked vent can prevent proper ventilation, leading to a dangerous pressure buildup. Regular maintenance and ensuring the vent is clear can help prevent this issue.