Keep the power-assist flowing and the steering effort light with the CARDONE Remanufactured Power Steering Pump 21-5394 (also written 215394). This unit generates the hydraulic pressure that drives the power-steering system, and it drops in as a direct-fit replacement for the 2003-2005 Mercedes-Benz ML350 and 2004-2005 Mercedes-Benz ML500. CARDONE remanufactures each pump to meet or exceed O.E. performance, scrutinizing the original design for potential improvements where applicable.
- Triple-tested internals: All critical components (campacs, spool valves, etc.) are triple-tested to ensure product reliability.
- Leak-resistant seals: Built with 100% new O-rings and premium-grade HNBR seals, which do not break down at high temperatures like conventional seal material.
- Precision-surfaced shaft: Shafts are surfaced to precise specifications to reduce premature seal wear and extend pump life.
- Calibrated relief valve: Supplied with a 100% tested and calibrated pressure relief valve.
Final assembly is computer-tested to measure pressure, bypass, fluid flow, valve operation, steering effort and noise. The remanufacturing process is earth-friendly, cutting the energy and raw material of a new part by 80%. If a worn or leaking power steering pump is behind heavy steering, whining, or fluid loss, this unit replaces it. See the Buyer's Guide tab for engine specifics on your vehicle.
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does this power steering pump do?
It generates the hydraulic pressure that operates the power-steering system, reducing the effort needed to turn the wheel. It is a remanufactured unit engineered to meet or exceed O.E. performance.
Which vehicles does the 21-5394 pump fit?
It is a direct-fit replacement for the 2003-2005 Mercedes-Benz ML350 and 2004-2005 Mercedes-Benz ML500. Check the Buyer's Guide tab for engine specifics on your vehicle.
What seals are used in this pump?
It is built with 100% new O-rings and premium-grade HNBR seals. HNBR does not break down at high temperatures the way conventional seal material can, helping resist leaks.
How is the pump tested before shipping?
Critical components are triple-tested, and the final assembly is computer-tested to measure pressure, bypass, fluid flow, valve operation, steering effort and noise.
What are signs my power steering pump may need replacing?
Common signs include whining or groaning while turning, heavy or stiff steering, and fluid leaks. Diagnose the cause first, since these symptoms can have other sources.
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