1100 250 021 (without gear), Twin Cylinder, Air Compressor

The heavy-duty twin cylinder air compressor is engineered to provide consistent pneumatic pressure for heavy commercial vehicle braking systems. This component features a robust construction with a cylinder bore of Ø85.00 mm and a stroke of 56 mm, ensuring high-strength performance in demanding environments. The integration of a water-cooled valve plate and specific water inlet/outlet ports (M16x1,5) allows for efficient thermal management during operation.

1100 250 021 is the OE equivalent of the MERCEDES BENZ A4571304815 SP1 twin cylinder air compressor used in MERCEDES BENZ heavy commercial vehicles. This precision-engineered part maintains strict compatibility with the vehicle's pneumatic system architecture. The design includes an ESS feature and optimized port sizes for seamless integration into the existing engine-driven air supply loop.

Workshop technicians should note the specific port configurations, including the M26x1,5 air inlet/outlet and the M12x1,5 unloader port, to ensure correct assembly. Regular maintenance of the water cooling circuit is essential to preserve the longevity of the water-cooled valve plate. When replacing this unit, verify that all connections to the air brake system are secure and that the through-drive mechanism aligns perfectly with the drive source to prevent mechanical wear.