Mercedes S Class W220 WABCO AIR SUSPENSION COMPRESSOR PISTON RING REPAIR FIX Noisy suspension? Is your vehicles air suspension rising slowly or perhaps failing to rise at all? 'Air Suspension Issues' Red light lit? 'Stop. Car Too Low, 5503 - The car is taking too long to fill the central reservoir, 5505, 5508 - The system can't build up pressure? VEHICLES AFFECTED: Mercedes S Class 1998-2005 (w220) Associated part numbers, our kit will only repair Wabco compressors. A2113200304 Wabco: 415 403 303 0, 415 403 112 0. THE CAUSE: The piston ring within your vehicles EAS air compressor is worn reducing output significantly. The poor quality piston ring within your air suspensions compressor wears over time causing these symptoms. The piston ring within the compressor unit of your air suspension system deteriorates over time, the OEM piston ring is made from a soft plastic that wears quickly, this wear substantially reduces the output of your compressor leading to noisy. THE SOLUTION: Fit our improved design PTFE piston ring and restore your compressor to full health! Simply install our replacement PTFE piston ring and restore your compressor, full instructions are included to guide you through this simple process which should take under 30 minutes. Our item is made from PTFE which has far superior wear resistance compared to the OEM part providing a permanent fix to the problems with your compressor. › See more product details