2021 Mercedes-AMG GLC 43 Air-Suspension Sag: High-Pressure Line Leak Repair
A 2021 Mercedes-AMG GLC 43 X253 with 60,000 km developed a pronounced one-sided front-axle sag. Leak-detection liquid produced activity at a heat-aged high-pressure line connection, while the air-spring bellows held and the distribution valve was not identified as leaking, supporting a line-only repair. After a stress-free replacement-line installation, service-mode restoration, height calibration, and code clearing, the source reports zero static height loss over 24 hours plus normal dynamic mode operation.